单词：engineering geological classification of rock mass
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AS IT IS 2015-08-30 Student Develops Gun Unlocked by Fingerprint 学生开发由指纹解锁的枪 A gunman killed two members of a television news crew in the United States earlier this week. Their TV station broadcast the shooting live, in real tim
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Remember seesaws? Those things were great. But there was often a problem. Suppose theres a big kid on one side and a smaller kid on the other side. The seesaw just stays in one position: big kid on the ground, smaller kid up in the air. No fun. After
英语听力文摘 English Digest
Remember seesaws? Those things were great. But there was often a problem. Suppose theres a big kid on one side and a smaller kid on the other side. The seesaw just stays in one position: big kid on the ground, smaller kid up in the air. No fun. After
英语听力文摘 English Digest