Some people moved in silky, liquid movements, others were jerky, probably drunk.一些人动作平稳流畅，其他人则跌跌撞撞，大概是喝醉了。She lit a cigarette with quick, jerky movement.她用急促的动作点着了香烟。Jerky word is to be short of calcium likely.抽筋的话有可能是缺钙...
等容粒径在沉沙输移中意义不大.The nominal diameter has little significance in sediment transportation.“等容粒径”是某一球体直径,它与某已知的颗粒体积相等.Nominal diameter is the diameter of a sphere of the same volume as the given particle.最高气缸压力高的循环燃烧速率快、燃烧过程...
我发觉很难教他什么东西。I'd be hard pushed to teach him anything.笨人难教.A stupid fellow is difficult to teach.热力学是很难教的一门课。Thermodynamics is a hard course to teach....