名词
中文翻译：初花期
同义词：
['pre-emergent', 'pre-emergence']
例句：
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1. The preemergentherbicide is effective against weeds that emerge before the main crop.
这种初花期除草剂对在主要作物之前出现的杂草有效。
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2. The farmersused to use a preemergentherbicide to control weedsin their fields.
农民过去使用一种初花期除草剂来控制他们的田地中的杂草。
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3. The preemergentherbicide was sprayed on thecrops to prevent weeds from emergingbefore the main crop.
初花期除草剂被喷洒在作物上，以防止杂草在主作物出现之前生长。