火箭发动机的作用是瞬间的, 在适当的地方燃烧推进物生成 高速 粒子.A rocket motor's'bullets'are minute, high - speed particles produced by burning propellants in a suitable chamber.一种蓝色透明、有磁性的液体,由压缩气态氧获得,用作火箭推进物中的氧化剂.A two - component roc...
Our teacher rarely condescends to speak with us outside of class.我们老师很少在课堂外屈尊与我们轻松地谈话.He never condescends to any person.他从不谦恭对人.He never condescends to speak to me.他从来未曾屈尊与我谈话....
本文所持的论点恰恰是站在相反的立场。The argument contained herein takes exactly the opposite point of view.现在让我来将我的论点串起来。Let me now pull together the threads of my argument.从智识、道德和现实的角度来看，这一论点是站不住脚的。This argument is untenable from an inte...