详细解释:a. 常年的, 长期的, 反复的
【医】 多年生的
词型变化：
副词:perennially英语解释：
名词 perennial:
a plant lasting for three seasons or more形容词 perennial:
lasting three seasons or morelasting an indefinitely long time; suggesting self-renewalrecurring again and again同义词：recurrent, repeated