单语范例（未经PONS编辑处理）
英语
- Variations in yields are due mainly to variation in climate, genetics, and the level of intensive farming techniques (use of fertilizers, chemical pest control, growth control to avoid lodging).en.wikipedia.org
- You won't have to be faced with the chemical pest control dilemma either.www.burlingtoncountytimes.com
- It doesn't matter whether they are big or small, committed to organic or chemical pest control, producing grain or livestock, they all have a story to tell.www.winnipegfreepress.com
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英语