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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In this way, DDT before it was banned reached levels high enough to seriously disrupt the re production of many birds in North America, especially hawks, owls, and eagles.

通过这种方式，DDT在被禁止之前其含量已经很高，足以严重破坏北美许多鸟类的繁殖，尤其对于鹰和猫头鹰的破坏更为严重。

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Many countries, especially in the tropics, still permit the use of DDT.

在热带地区的许多国家，仍然允许使用DDT。

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Many countries, especially in the tropics, still permit the use of DDT.

在热带地区的许多国家，仍然允许使用DDT。

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