| 1. | Systemic insecticides have shown particular promise .
内吸杀虫剂看来特别有效。
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| 2. | Both aldrin and chlordane are valuable insecticides .
艾氏剂和氯丹都是重要的杀虫剂。
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| 3. | Resistance to insecticides has been apparent for many decades .
杀虫剂抗药性的出现已有数十年。
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| 4. | Farm workers frequently come in contact with these insecticides .
农场工人常常接触这些杀虫剂。
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| 5. | Insecticides are widely used for controlling most insect pests .
杀虫剂广泛应用于防治大多数害虫。
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| 6. | Spraying the area around buildings with an insecticide also prevents insect buildup .
建筑物周围喷洒杀虫药也能防止昆虫孳生。
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| 7. | Spraying the area around buildings with an insecticide also prevents insect build up .
建筑物周围洒布杀虫药也能防止昆虫孳生。
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| 8. | As preventive, spray plants with systemic insecticide or fumigate them regularly .
作为预防措施，要用内吸杀虫剂对植物定期喷洒，或熏蒸。
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| 9. | I have decided to specialize in plant chemicals that can be used for insecticides .
我已经下决心专门研究可以用作杀虫剂的植物中的化学物质。
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| 10. | Spraying with insecticides and fungicides may be necessary to control any insects and diseases .
也许有必要喷洒杀虫剂和杀菌剂以防止病虫害。
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