名词 perennial:

1. (botany) a plant lasting for three seasons or more

perennialadj.永久的；反复出现的；多年生的n.多年生植物perennial canal常年渠道perennial youth青春常驻perennial yield持久不断的量perennial plant多年生植物perennial river常流河,长流河,常年河流perennial change多年变化perennial flower宿根花卉perennial forage多年生牧草perennial plants多年生植物perennial colony多年群体

1. Direct domestication of wild perennials is the more straightforward approach to creating perennial crops.
   要创造出多年生作物，直接驯化野生的多年生植物，是较直截了当的做法。
2. Perennials - It makes sense to eliminate perennial weeds early.By pulling those first plants, you might prevent a hostile lawn takeover.
   多年生植物，尽早去除很有意义，当把大量杂草去处后，就可以避免草坪被杂草统治。