In the mid-1900s, the pesticide DDT caused bald eagle eggshells to become thin and fragile.

在20世纪中期，农药滴滴涕（DDT）导致白头海雕的蛋壳变得异常薄脆。

DDT is a chemical used to kill insects.

DDT是一种用于杀死昆虫的化学物质。

Like bald eagles, their populations had been killed by widespread DDT pesticide use.

与秃鹰一样，它的种群也因滴滴涕杀虫剂的广泛使用而死亡。

It warned of the use of a chemical called DDT.

这本书警告人使用一种名为DDT的化学物质。

The comrade who said you know with the problem of cockroaches and we decided to bring DDT, the guy who said you know blessed are those who follow the path of their days, something that they shouldn't increase .

那位谈到蟑螂问题的同志" 我决定使用杀虫剂" ，以及那位称幸运者顺时而为的人不应多此一举。

Rachel's friend owned a protected area for birds. An airplane had flown over the area where the birds were kept and spread a powerful chemical called DDT.

蕾切尔的朋有一个鸟类保护区。一架飞机飞过这片地区，投下化学物质DDT。

The fact is that DDT was widely used 50 years ago and virtually eliminated this mosquito from the Americas but DDT was also widely used in agriculture.

事实上50年前就曾广泛使用滴滴涕而且几乎已将这种在美洲的蚊子彻底根除，但这种杀虫剂也广泛用于农业。

They also found evidence that the whale had been exposed to pesticides such as DDT, with the highest levels during the whale's first six months of life.

还发现证据证明蓝鲸曾接触 DDT 等杀虫剂，并且出生后六个内的接触量最高。

So they seem to be moving in the right direction because we took action, because we banned DDT, because California banned lead shots.

它似乎正在朝着正确的方向发展，因为我采取了行动，我禁止了 DDT，加州也禁止了铅弹。

Finally, a chemical called DDT, which was used to kill insects, was poisoning the eagles and stopping them from hatching healthy chicks.

后来一种名叫“滴滴涕”的杀虫剂毒害了很多鹰，中毒的鹰无法孵化出健康的幼鸟。

She suggested that exposure to DDT might alter the structure of genes, with unknown consequences for future generations.

她还推断滴滴涕可能改变基因结构，对生物体的后代造成无法预测的后果。

And DDT and PCBs two of the most poisonous and long-lasting substances known continue to threaten aquatic wildlife.

滴滴涕和多氯联苯是已知的两种毒性和持久性最强的物质，它继续威胁水中的野生动物。

Did they've thoughts about possibly using DDT?

有考虑使用DDT滴滴涕吗?

In 1972 the use of DDT was banned in the United States.

1972年，全美禁用杀虫剂“滴滴涕”。

After DDT was banned in the U.S. in 1972, biologists brought young pelicans from nearby Florida to repopulate empty islands across the Gulf of Mexico.

1972年，滴滴涕在美国被禁止后，生物学家从附近的佛罗里达州带来了年幼的鹈鹕，让它在墨西哥湾的空岛上重新定居。

The writer blamed their deaths on a pesticide called DDT that exterminators had sprayed on a nearby marsh.

写信人认为鸟儿的死因与一种叫滴滴涕（DDT）的杀虫剂有关，灭虫员将这种药喷洒在了附近的沼泽里。

The chemical DDT was causing their eggshells to be soft and to break, and so they couldn't reproduce.

化学物质 DDT 导致它的蛋壳变软并破裂，使它无法繁殖。

Rachel Carson did not live to see how her book influenced the government's decision to ban DDT.

蕾切尔·卡逊并没有活着看到自己的书籍如何影响政府决定禁止DDT。

The letter was the push Carson needed to investigate DDT.

正是这封信促使卡森展开了对滴滴涕的调查。

American officials banned DDT in 1972.

美国官员于1972年禁止使用杀虫剂。