您要查找的是不是：
- He came to look at the drainage. 他是来检查排水设备的。
- The drainage system has been aged. 排水系统已经老化了。
- The ratio of students to teachers is 35:1. 学生和老师的比率是三十五比一。
- The ratio of schoolboys to schoolgirls is 2 to 1. 男学生和女学生的比例是2比1。
- Men outnumber women here in the ratio of three to one. 此地男子数量以三比一超过女子。
- The drainage of the town is not good, some of the pipes are broken. 城里的排水系统不好,有些水管断裂了。
- The first or last term of a ratio or a series. 首项，末项比率或数列中第一个或最后一个项
- We must dig a drainage ditch to run off the water. 我们得挖一条排水渠把水排掉。
- drainage ratio 迳流率,迳潦
- The town's drainage is very efficient. 这城市的排水系统很好。
- After-tax profit margin is the ratio of net income to net sales. 税後利润率指净收入与净销售之比。
- A drainage passage, as to a culvert. 排水沟排水通道，如阴沟
- The ratio of men to women was two to one. 男女的比例是二比一。
- Is there adequate drainage where needed? 需要排水的地方其排能是否足够?
- The interval between any two frequencies having a ratio of2 to1. 倍频程频率比率为2比1的两个频率的间隔
- Pancreatic abscess obviously requires drainage. 胰腺脓肿显然需要引流。
- The area has good natural drainage. 这个地区有良好的天然排水系统。
- The bricks were bedded in sand to improve drainage. 沙里埋入砖块，以改进排水系统。
- The strike is the ultima ratio of Trade Unionism. 罢工是工联主义的最后手段。
- Acid Drainage Killing Some Fish in Ky. 河流遭酸性排放,鱼和昆虫死亡。
