Before the race, he is fine. But afterwards he is worn out.赛前他状态很好，赛后就筋疲力尽了。"You're worn out, Laura," he said. "Go home and get some rest."“你太累了，劳拉，”他说，“回家休息一下吧。”These shoes are worn out.这双鞋破得不能再穿了。...
起初我们着手研究的是看起来似乎最简单和最明显的滤波器.We started with what seemed the most simple and obvious filter.在适当条件下,多层膜还可作滤波器.Under appropriate conditions a multilayer may also be employed as a filter.这个信号送到滤波器 - 放大器,它是由变压器耦合到视频检波器的.The si...
雨水过多是亚马逊河与刚果河流域赤道地区的大问题.Too much rain is the problem of the equatorial lands in the Amazon and Congo basins.亚马孙河流域已有40万平方公里的森林遭到滥伐。400,000 square kilometres of the Amazon basin have already been deforested.尼罗河流域一年四季气候温和。...