名词
中文翻译：多年生杂草
同义词：
['annual weed', 'perennial grass', 'perennial herb']
例句：
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1. The gardenwas overrun with perennial weeds that needed to be pulled out.
花园里长满了需要拔除的多年生杂草。
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2. The farmer had to spend a lot of time removing the perennial weeds from his fields.
农民不得不花很多时间从他的田地中除去多年生杂草。
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3. The farmers were worried about the perennial weeds that were growing in their crops.
农民们担心他们的庄稼里生长着多年生杂草。