The city has trebled the number of its prisoners to 21,000.该市的囚犯人数增长了两倍，达到21,000人。Their profits have trebled in the last two years.最近两年他们的利润增加了三倍.It's value has trebled.它的价值已增长到原来的三倍....
Double crank four ring - plate type cycloid drive is a new type drive.双曲柄四环板式针摆行星传动是一种新型传动.The vibration performance of cycloid ball planetary reducer was analyzed.分析摆线钢球行星传动减速器的振动特性.For this reason the cycloid is called...
...open sewers.裸露的下水道The sewers collected sewage and storm runoff and discharged it, untreated, into the harbour.污水和暴雨径流汇入下水道后被直接排入海港。...the muck and mire of sewers and farm- yards.下水道和农家庭院的污垢和烂泥Once a year they have to ...