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。
- I have mastered the rudiments of economics. 我已精通经济学的基本原理。
- Economics is easy after you learn the lingo. 在学了专门术语后经济学就简单了。
- He is distinguished for his knowledge of economics. 他以经济学方面的精湛学识而著称於世。
- She is studying economics at college. 她在大学里读经济学。
- 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。
- We must dig a drainage ditch to run off the water. 我们得挖一条排水渠把水排掉。
- The town's drainage is very efficient. 这城市的排水系统很好。
- The subject of Reaganomics is the supply-side economics. 雷根经济学的主题是供给面经济学。
- The economics of national growth are of great importance. 国民经济的增长情况具有极大的重要性。
- A drainage passage, as to a culvert. 排水沟排水通道，如阴沟
- When they start talking about economics, I'm out of my depth. 他们一谈起经济学，我就一窍不通了。
- Is there adequate drainage where needed? 需要排水的地方其排能是否足够?
- A knowledge of economics is fundamental to any understanding of this problem. 经济知识对于理解这个问题是至关重要的。
- 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。
- Acid Drainage Killing Some Fish in Ky. 河流遭酸性排放,鱼和昆虫死亡。
- Both uses tend to improve drainage. 两者对排水都有改进作用。
