Question

illusion 【illusion】n. 错觉；幻象The white walls create the illusion that the room is very large.白色的墙壁制造错觉，好像房间很大。

Accepted Answer

[ɪ'luːʒn] 
illusionan erroneous mental representation
An illusion is something that isn't real. It may look real, but it's actually fake — just a crafty construction or fantasy. Like the old rabbit-out-of-the-hat trick practiced by magicians around the globe.
An illusion is an act of deception. Some optical illusions are pretty cool to watch, but an illusion can also point to an erroneous belief or false perception of reality, which is where you start getting into hallucination territory — seeing things that aren't there. You can give the illusion that you’re fascinated by your professor’s lecture by chewing on your pencil, furrowing your brow, and making sure to nod enthusiastically every so often.
All forms of 'illusion' will appear on average once every 297 pages.disillusioneddisillusioningdisillusionmentdisillusionillusionillusionalillusionaryillusionistillusory
CHOOSE RIGHT WORDS: ALLUSION-ILLUSION-DELUSION
			
  Novelists, magicians, and  other tricksters keep these words busy. Novelists love an allusion, an indirect reference to something  like a secret treasure for the reader to find; magicians heart illusions, or fanciful fake-outs; but tricksters suffer from delusions, ideas  that have no basis in reality. 
Blink  and you'll miss it: an allusion is a quick  indirect mention of something. It's a literary device that stimulates ideas,  associations, and extra information in the reader's mind with only a word or  two:

Littlemore was not quick at  catching literary allusions. (Henry James)
  Thomas Paine's writings contain  several affectionate allusions to his father, but none  to his mother. (Daniel Moncure Conway)

Magicians love to create illusions, or visual tricks, like making  a tiger disappear or sawing a person in half. Your eye can be fooled by an  optical illusion, and Dorothy and the  gang get to the bottom of the Wizard's illusion and discover he's just a regular guy. Illusions aren't always glamorous; sometimes they're just hiding the man behind the  curtain:

"We have no illusion that these credits are going to create lots of new jobs," the editorial said. (New York Times)
  
    But while  investing in your company's stock might feel safer than betting on the stock  market as a whole, that is usually an illusion. (Seattle  Times)

Delusions are like illusions but they're meaner. A delusion is a belief in something despite the fact that it's completely untrue. Hence  the phrase is delusions of grandeur. People with delusions often wind up on the shrink's couch. Whether you are  trying to deceive yourself or someone is trying to deceive you, if you believe  the false idea, you have a delusion about reality:

Delusions are closely  allied to hallucinations and generally accompany the latter. (Samuel Henry Prince)
  Two medical  experts had concluded then that the accused gunman suffered from schizophrenia,  disordered thinking and delusions. (Reuters)
  "Basically, I think he's  suffering from delusions of grandeur," he said. (Chicago Tribune)

An allusion shows up in art,  while illusions love kids' parties.  If you believe something despite  reality, you have a delusion.

Front	illusion
Pron	[ɪ'luːʒn]
Back	【illusion】 n. 错觉；幻象 The white walls create the illusion that the room is very large. 白色的墙壁制造错觉，好像房间很大。
Vocab	illusionan erroneous mental representation An illusion is something that isn't real. It may look real, but it's actually fake — just a crafty construction or fantasy. Like the old rabbit-out-of-the-hat trick practiced by magicians around the globe. An illusion is an act of deception. Some optical illusions are pretty cool to watch, but an illusion can also point to an erroneous belief or false perception of reality, which is where you start getting into hallucination territory — seeing things that aren't there. You can give the illusion that you’re fascinated by your professor’s lecture by chewing on your pencil, furrowing your brow, and making sure to nod enthusiastically every so often. All forms of 'illusion' will appear on average once every 297 pages. disillusioned disillusioning disillusionment disillusion illusion illusional illusionary illusionist illusory CHOOSE RIGHT WORDS: ALLUSION-ILLUSION-DELUSION Novelists, magicians, and other tricksters keep these words busy. Novelists love an allusion, an indirect reference to something like a secret treasure for the reader to find; magicians heart illusions, or fanciful fake-outs; but tricksters suffer from delusions, ideas that have no basis in reality. Blink and you'll miss it: an allusion is a quick indirect mention of something. It's a literary device that stimulates ideas, associations, and extra information in the reader's mind with only a word or two: Littlemore was not quick at catching literary allusions. (Henry James) Thomas Paine's writings contain several affectionate allusions to his father, but none to his mother. (Daniel Moncure Conway) Magicians love to create illusions, or visual tricks, like making a tiger disappear or sawing a person in half. Your eye can be fooled by an optical illusion, and Dorothy and the gang get to the bottom of the Wizard's illusion and discover he's just a regular guy. Illusions aren't always glamorous; sometimes they're just hiding the man behind the curtain: "We have no illusion that these credits are going to create lots of new jobs," the editorial said. (New York Times) But while investing in your company's stock might feel safer than betting on the stock market as a whole, that is usually an illusion. (Seattle Times) Delusions are like illusions but they're meaner. A delusion is a belief in something despite the fact that it's completely untrue. Hence the phrase is delusions of grandeur. People with delusions often wind up on the shrink's couch. Whether you are trying to deceive yourself or someone is trying to deceive you, if you believe the false idea, you have a delusion about reality: Delusions are closely allied to hallucinations and generally accompany the latter. (Samuel Henry Prince) Two medical experts had concluded then that the accused gunman suffered from schizophrenia, disordered thinking and delusions. (Reuters) "Basically, I think he's suffering from delusions of grandeur," he said. (Chicago Tribune) An allusion shows up in art, while illusions love kids' parties. If you believe something despite reality, you have a delusion.

Illusion Delusions Create Magicians Love Allusion Erroneous Optical