1. biennial的解释

1. 两年一次的：98.biannual一年两度的 | biennial两年一次的 | 99.chord琴弦

2. biennial的意思

2. 二年生的：bicapsular 二蒴果的 | biennial 二年生的 | biennial fodder crop 二年生饲料罪

3. 每两年的：bi-两,双 | biennial每两年的 | bilingual会说两语言的

1. 两年一次的
    A biennial event happens or is done once every two years.

    e.g. ...the biennial Commonwealth conference.
           两年一届的英联邦会议

2. 二年生植物
    A biennial is a plant that lives for two years. It flowers, produces seed, and dies in its second year.

danci.911cha.com

1. (botany) a plant having a life cycle that normally takes two seasons from germination to death to complete
    flowering biennials usually bloom and fruit in the second season

1. having a life cycle lasting two seasons

    e.g. a biennial life cycle
           parsnips and carrots are biennial plants often grown as annuals

    Synonym: two-year

2. occurring every second year

    e.g. they met at biennial conventions

    Synonym: biyearly