biennial
UK/bai'eniәl/US
GREC2
释义
adj.
Happening once every two years.
两年一次的。
adj.
(Of a plant) living for two years, flowering in the second.
（植物）两年生的，第二年开花。
n.
A plant with a two-year life cycle; an event held every two years.
两年生植物；两年一届的活动。
词根拆分
词根派生bi-（二）+ enn（annus「年」的 -enn- 变体）+ -ial =「每两年的」。与 centennial 同一构词模式：数字前缀叠在「年」词根上。biennial conference 每两年开一次；biennial plant 用两年走完生命周期。
词根 ann 还连着 9 个词常用搭配
- 1.biennial event两年一次的活动
例句
- 1.
The art biennial attracts visitors from around the world.
这场两年一届的艺术双年展吸引了世界各地的游客。
- 2.
Foxgloves are biennials, flowering in their second year.
毛地黄是两年生植物，第二年开花。
- 3.
The committee holds biennial elections.
委员会每两年举行一次选举。
易混词辨析
biennial 与 biannual——经典陷阱。biennial = 每两年一次；biannual = 一年两次（即 semiannual）。两者频率相反，所以写作时常干脆说「twice a year」以免歧义。每两年 → biennial。