单词：perennials
perennials的用法和样例：
例句
- 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。
- 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。
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