A defeated candidate for the House of Representatives must wait two years before running again, because the elections are biennial.

一位竟选失败的众议院候选人需等两年才能再度竞选，因为选举是两年一次的。

▷biennial [baɪ'eniəl]（adj.）

【释义】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.

happening once every two years

两年一次的

▷biannual [baɪ'ænjʊəl]（adj.）

happening twice a year

【释义】Use biannual to describe something that happens two times a year. Cleaning out the garage may be a biannual project in your household, or your dentist might insist on biannual check-ups.一年两次的，一年两度的；半年一次的

The committee has just published its biannual report.委员会刚刚公布了半年报告。

每日N词 | bicameral-两院制的 | 20170922

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