1
- taking place every other year两年一次的, 每隔一年的。比较BIANNUAL:
summit meetings are normally biennial.
首脑会议通常两年举行一次。
2
- (of a plant) taking two years to grow from seed to fruition and die（植物） 二年生的。比较ANNUAL, PERENNIAL.
USAGE
Biennial and biannual are often confused. Biennial means 'occurring every two years' （the biennial Ryder Cup tournament）, while biannual means 'twice a year' （the solstice is a biannual event）. See also usage at BI-.
派生词
biennially
adverb词源
early 17th cent.: from Latin biennis （from bi- 'twice' + annus 'year'） + -AL.