通俗科技英语文选 第3辑PDF电子书下载

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Contents 1

Crossing the Sea 1

Movements of the Earth’s Water 3

Helicopters 6

The Ecosystem Concept 10

Atomic Smashers-50 Years 14

A Pollution Sensor 19

Antarctica 21

Unique Aircraft 25

Future City in the Sea 28

Zhan Tien-you—A Great Patriotic Engineer 32

Three UFOs—How Real Were They？ 38

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