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Massive machines require engineering extremes. The massive man-made satellite, commonly known as the International Space Station, hurtling around the Earth at 27,600 km an hour, has been a temporary home for humans for the last 20 years. The biggest land vehicle on earth, a bucket excavator titled Bagger 293, that can move 240,000 cubic meters of dirt each day. Innovation has a...。抗战胜利后的四十年代中后期，美国总统的使者--赫尔利、马歇尔和司徒雷登，在国共和谈与内战中，分别担当了调停者以及参与者的角色。讲述了这三位美国总统使者在国共和谈与内战关键时刻所扮演的角色。。