(biennial 的复数) n. 两年生植物, 两年一次的事

a. 两年生的, 两年一次的

plural of biennial

n. (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

a. having a life cycle lasting two seasons

s. occurring every second year