1
[CONJ-SUBORD 连词]（说明原因）因为，由于 You use
because when stating the reason for something.
He is called Mitch, because his name is Mitchell...
人们叫他米奇，因为他大名叫米切尔。
Because it is an area of outstanding natural beauty, you can't build on it...
考虑到这一带自然风光旖旎，你不能建在这里。
Women are doing the job well. This is partly because women are increasingly moving into a man's world...
女性工作出色，部分原因在于她们越来越多地涉足男性的领域。
'Why didn't you tell me, Archie?'— 'Because you might have casually mentioned it to somebody else.'
“你怎么没告诉我呀，阿奇？”——“因为你可能会一不小心说了出去。”
2
[CONJ-SUBORD 连词]（作出解释）因为 You use
because when stating the explanation for a statement you have just made.
Maybe they just didn't want to ask too many questions, because they rented us a room without even asking to see our papers...
也许他们只是懒得问太多的问题，因为他们都没要求看我们的证件就把一个房间租给我们了。
The President has played a shrewd diplomatic game because from the outset he called for direct talks with the United States...
总统玩了一场高明的外交游戏，因为从一开始他就要求和美国直接对话。
I had a sense of déjà-vu because I could recognise everything in London.
我有一种似曾相识的感觉，因为我能认出伦敦的一切。
3
[PREP-PHRASE 短语介词]因为；由于 If an event or situation occurs
because of something, that thing is the reason or cause.
Many families break up because of a lack of money...
许多家庭由于缺钱而破裂。
Because of the law in Ireland, we had to work out a way of getting her over to Britain.
由于爱尔兰的法律所限，我们不得不想办法把她弄到英国去。
4
[PHR-CONJ-SUBORD ]仅仅因为 You use
just because when you want to say that a particular situation should not necessarily make you come to a particular conclusion.
[INFORMAL 非正式]
[SPOKEN 口语]
Just because it has a good tune does not mean it is great music...
仅凭旋律优美并不见得就是一首杰出的音乐作品。
Just because something has always been done a certain way does not make it right.
仅仅因为老是以某种方式做事并不意味着这么做就是对的。
Usage Note :
You can use because, as, since, or for to give an explanation for something. Because is the commonest of these, and is used when answering a question beginning with 'why?'.You can use as or since instead of because to introduce a clause containing a reason for something, especially in writing. ...a note about The National Portrait Gallery, as the word 'Gallery' can be misleading... Since the juice is quite strong, you should always dilute it. In stories, for is sometimes used to explain or justify something. He seemed to be in need of company, for he suddenly went back into the house. Note that because is a conjunction, and is used to link two ideas within one sentence. I'm unsocial, because of my deafness.
because, as, since 或者 for 都可以用来给出解释。because 最常用，用来回答以 why 开头的疑问句。as 或 since 可以代替 because 引导原因从句，尤其是在书面语中：a note about The National Portrait Gallery, as the word ‘Gallery’ can be misleading（对 The National Portrait Gallery 的注释，因为 Gallery 一词容易令人误解），Since the juice is quite strong, you should always dilute it（这种果汁太浓，所以必须加以稀释）。在故事中，for有时用于解释或论证：He seemed to be in need of company, for he suddenly went back into the house（他看起来需要陪伴，因为他突然回到了屋里）。注意，because 是连词，用来连接一个句子中的两个观点：I'm unsocial, because of my deafness（我耳朵聋，所以不善交际）。