二年一次的生命循环；防风草和胡萝卜是经常每年都种的二年生植物。

A biennial life cycle; parsnips and carrots are biennial plants often grown as annuals.

防风草和胡萝卜是二年生植物,但却经常被作为一年生植物来种植.

Parsnips and carrots are biennial plants often grown as annuals.

南非一个一年或二年生植物属,其花只在明亮阳光下开放.

South African annual or biennial plants having flowers that open only in bright sunlight.