"a biennial life cycle"
"parsnips and carrots are biennial plants often grown as annuals"
two-year的用法和样例:
例句
用作形容词 (adj.)
Some biennials can be induced to act as annuals and flower in the first year by appropriate cold or hormone treatments. 适当的低温或激素处理可以诱导一些二年生植物变成一年生植物并且开花。