There is widespread resistance of lice to some insecticides, especially DDT, and expert local advice must be sought.

虱子之中的耐药现象很严重，尤其是对于DDT，所以需要寻求当地专家的意见。

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But a growing demand for food drove a global shift to synthetic pesticides last century, especially once DDT and similar insecticides hit the market.

但是上世纪食物的巨大需求导致化学合成农药在世界范围内大量使用，尤其是滴滴涕和类似的农药问世以后。

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DDT metabolites, especially DDE. Still found on some agricultural products.

DDT的代谢产物，特别是DDE。仍存在于一些农产品。

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