She gave him a bright, determined smile which seemed unnatural.她对他开朗、坚定地一笑，但笑得有点不自然。I consider activities such as jogging and weightlifting as unnatural.我认为像慢跑、举重这样的运动不符合自然规律。The aircraft rose with unnatural speed on tak...
The EP antiwear property is different that it contains different additives.不同的添加剂配伍,聚脲润滑脂的极压抗磨性也不一样.The antiwear & friction reducing mechanism of nano materials was summarized.综述了纳米材料的 抗磨 减摩机理.The antiwear hydraulic oil ...
解释为什么钡能形成过氧化物而铍则不能。Explain why barium forms peroxide but beryllium does not.然而铍的毒性限制了它的作用.However the toxic properties of beryllium limit its application.但如果用铝包覆铍,则可避免加工过程中及储存期间的中毒问题.Toxicity problem in manufacturing and...
Don't hang up!别挂电话！He's got a real hang-up about his height.他为他的身高很是苦恼。You hang up hurriedly and attend to baby, crockery, etc.你慌忙挂上电话,去照料孩子, 去收拾陶器, 等等....