Teachers often view youth workers as undisciplined and ineffectual.老师们常认为青少年工作者纪律性差且能力低下。Our Intelligence Service was untrained, cumbersome, and almost wholly ineffectual.我们的情报部门人员缺乏训练，机构臃肿，简直毫无用处。He is a well-meaning bu...
The dynamic SIF variation was found to lag behind the stress - pulse imingement by several microseconds.动态应力强度因子的变化发现滞后于应力脉冲冲击几微秒.The dynamic SIF variation was found to lag behind the stress - pulse impingement by severa...
从务实角度来说，音乐电视网的生存依赖于把年轻人市场卖给广告商。Pragmatically, MTV's survival depends on selling the youth market to advertisers.他关心人类生存环境的改善。He was concerned with the enhancement of the human condition.大型工厂正试图通过削减成本以维持生存。The big fa...
他们不时地听到大卡车的轰鸣声。Now and then they heard the roar of a heavy truck.人群里不时发出几声抱怨和欢呼。Scattered groans and whoops broke out in the crowd.要抬起头，不时看看四周。Keep your head up, and look around you from time to time....