以下为句子列表：
英文: By 1970 DDT spraying, elimination of mosquito breeding sites and the expanded use of antimalarial drugs freed more than 500 million people, or roughly one third of those previously living under malaria's cloud.
中文: 到了1970年，由于喷灑DDT、清除蚊子繁殖地，以及扩大使用抗疟药物，超过五亿人得以免受疟疾的威胁，约略是原先生活在疟疾阴影下人口的1/3。
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英文: In the early 1960s, Rachel Carson's book Silent Spring heightened concern about the danger of indiscriminate pesticide use, and as a result, the Department of Agriculture banned the use of DDT completely in 1969.
中文: 60年代初，雷切尔·卡森所著的《沉默的春天》加深了人们对随意使用杀虫剂危害的担忧，因此1969年农业部彻底禁止了滴滴涕。
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英文: It is very difficult to research the burning characteristic of high energy propellant in the DDT pipe applying the ionization probe.But the satisfactory results can be easily got using photoelectricity triode.
中文: 用探针法研究DDT管中高能推进剂的燃烧波和爆轰波的传播特性，因各种因素的影响难以得到满意的结果，用光电三极管代替电离探针可得到相对理想的结果。
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英文: That same year, she offered an article to Reader's Digest on insecticide experiments going on at Patuxent, Md., not far from her home in Silver Spring, to determine the effects of DDT on all life in affected areas.
中文: 同年，她给读者文摘写了篇关于杀虫剂实验的文章，这个实验在离她家乡马里兰银泉市不远的帕塔森特执行，用来测量DDT对于受污染区域中所有生命体的影响。
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英文: The destruction of their natural homes could be the next DDT causing eagle numbers to drop quickly.
中文: 然而，秃头鹰的生存状况仍不容乐观，它们赖以生存的自然环境遭到破坏，无疑相当于再次使用“DDT”，也会让它们的数量再次剧减。
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