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孙慕兰因腰部扭伤无法继续从事她喜爱的芭蕾舞工作，忍痛改行，选择了电器推销员的工作。现实并不像她想象的那样美好，同行业的激烈竞争使她首战败北，一天，她接到好友甄真的电话，得知虎市电器经销公司将在虎市召开“电器订货会”她火速前往。虎市电器经营部长得知孙慕兰要来大为惊慌。于是他...。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...。