详细解释:n. 两年生植物, 两年一次的事
a. 两年生的, 两年一次的
【医】 二年生的, 二年生植物
词型变化：
副词:biennially英语解释：
名词 biennial:
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形容词 biennial:
occurring every second year同义词：biyearly