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1. This pesticide is effective against aphids and whiteflies.
这种杀虫剂对蚜虫和白粉虱有效。
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2.The farmers use this compound to control weeds in their fields.
农民们使用这种化合物来控制他们的田地中的杂草。
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3. The chemical was banned in some countries due to its potential health risks.
由于潜在的健康风险,这种化学物质在一些国家被禁止使用。