Question

biennial 【biennial】adj. 二年一次的The sophomores and seniors are taking the biennial exam this afternoon.今天下午二年级和四年级的学生正在考二年一次的考试。

Accepted Answer

[baɪ'eniəl] 
biennialoccurring every second year
If you’re just as fanatical about the luge as you are about beach volleyball, you probably know that the Olympic Games are on a biennial schedule. Every two years, either the Summer or the Winter Olympics takes place.
Don't mistake biennial for biannual, which means “twice a year.” Annoying? Yes, but other words containing the prefix bi- are even more troublesome. For example, bimonthly can mean either “twice a month” or “every two months.” To avoid confusion, you can use the prefix semi- to mean “twice during a certain time period.” So, it’s correct to say that the Olympics occurs on a biennial schedule, not on a semiannual (or biannual) one.
All forms of 'biennial' will appear on average once every 6159 pages.biennialbiennially

Front	biennial
Pron	[baɪ'eniəl]
Back	【biennial】 adj. 二年一次的 The sophomores and seniors are taking the biennial exam this afternoon. 今天下午二年级和四年级的学生正在考二年一次的考试。
Vocab	biennialoccurring every second year If you’re just as fanatical about the luge as you are about beach volleyball, you probably know that the Olympic Games are on a biennial schedule. Every two years, either the Summer or the Winter Olympics takes place. Don't mistake biennial for biannual, which means “twice a year.” Annoying? Yes, but other words containing the prefix bi- are even more troublesome. For example, bimonthly can mean either “twice a month” or “every two months.” To avoid confusion, you can use the prefix semi- to mean “twice during a certain time period.” So, it’s correct to say that the Olympics occurs on a biennial schedule, not on a semiannual (or biannual) one. All forms of 'biennial' will appear on average once every 6159 pages. biennial biennially

Biennial Olympics Prefix Baɪ'Eniəl Adj 二年一次的 Sophomores Seniors