Deep bed filtration 怎么翻译

Deep bed filtration 怎么翻译 filtration是什么意思? membrane filtration是什么 riverbank filtration什么意思 deep deep .. deep minerals for filtration怎么翻译 . bed bed 请解释下Rapid filtration技术如题,谢谢! Filtration is one of the most..短文翻译 boils,layers of filtration什么意思?原句began locking the target and the entire incident boils,layers of filtration The river is 4 metres deep 为什么不能说 The river is 4-metre-deep?有什么区别吗?He lives in a three-bed room on the first floor .为什么这里又不用three beds My bed is 1.2 meter tall（改错） Our room are 39 square meters.The ruler is 25 centimeters length.It can dive in the deep cold water. 89. Last night I saw Yang Weiwei lying in bed, _____in deep thought A. lost B. losing C. to lose D.选那一个呀,为什么? take deep deep and deep breath是什么意思?. deep fry