单词：management echelon
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[00:00.00]2 Pronunciation [00:03.82]Listen and say. [00:06.34]We're going to play football in the park. [00:10.28]I think we should go and get something to eat. [00:14.53]I'm hungry. [00:16.70]Give me five! [00:18.88]They're cool. [00:21.28]Sorry, gu
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Unit 3 Follow the signs! [00:05.20]单元三 跟随标志 [00:07.31]Say and act [00:09.20]说并且行动 [00:11.08]At the swimming pool Don't run!It's dangerous. [00:15.61]正在游泳池要不断游的！ 它是危险的。 [00:20.14]Don't jump int
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By David McAlary Washington 10 March 2006 Mars Reconnaissance Orbiter Another U.S. spacecraft has begun orbiting Mars to study the red planet in unprecedented detail. The Mars Reconnaissance Orbiter w
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