Question

biennial adj. 两年一次的 biennial (adj.) "lasting for two years" (1620s); "occurring every two years" (1750), from Latin biennium "two-year period," from bi- (see bi-) + annus "year" (see annual). The vowel change is "due to the Latin phonetic law according to which the unaccented and closed radical syllable of the second element of compounds, original -ă- becomes -ĕ-" [Klein]. The noun meaning "a biennial plant" is attested by 1770. 【记】bi 两 + annual 年

Accepted Answer

[bai'eniəl] 【英】 adj. 两年一次的(every two years )【记】 bi(两个,双)+enn(年) +ial→两年(一次)的 adj. 两年一次的(每两年发生一次的); 二年生的(两年生并于第二年开花的植物)【记】bi两, 双, enn年一两年一次的

单词	biennial
音标	[bai'eniəl]
解释	adj. 两年一次的
红宝书	【英】 adj. 两年一次的(every two years ) 【记】 bi(两个,双)+enn(年) +ial→两年(一次)的
字源	biennial (adj.) "lasting for two years" (1620s); "occurring every two years" (1750), from Latin biennium "two-year period," from bi- (see bi-) + annus "year" (see annual). The vowel change is "due to the Latin phonetic law according to which the unaccented and closed radical syllable of the second element of compounds, original -ă- becomes -ĕ-" [Klein]. The noun meaning "a biennial plant" is attested by 1770.
不择手段背单词	adj. 两年一次的(每两年发生一次的); 二年生的(两年生并于第二年开花的植物) 【记】bi两, 双, enn年一两年一次的
趣味全助记	【记】bi 两 + annual 年

Biennial Adj Years Latin Bai'eniəl 两年一次的 英 两年一次的(Every

Biennial Adj Years Latin Bai'eniəl 两年一次的英两年一次的(Every