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1135 、 晶体点阵;晶体格构;晶格 crystallattice 1136 、 棘轮和爪 ratchetandpawl 1137 、 棘齿 ratchet 1138 、 棘齿弓钻 ratchetbrace 1139 、 壳型模塑 shellmoulding 1140 、
This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. If you have a dog, you know you gotta walk it. But do you know how it walks? Well, if you have no idea which foot Fido puts forward when, youre in good c
AS IT IS 2014-09-03 Virginia Site Tests Drones for FAA Rules 维吉尼亚测试无人机以帮助航空管理局制定发展规则 The Federal Aviation Administration, or FAA, has chosen a university town in Virginia as one of six places to test dron
MELISSA BLOCK, HOST: In the early 1900s, a housewife in Michigan started studying young children in her living room. She called it a cosmic laboratory of baby training. From that inauspicious beginning sprang something that is now a multimillion-doll
今天我们要学的词是stability。 Stability, 是稳定的意思。Political stability, 政治稳定;economic stability, 经济稳定。时代周刊2007年的年度人物是俄罗斯总统普京。时代周刊对普京的评价是,He stands,