The body screw back into place, gently open the little front-end ball valve, using compressed air to the drainage system of impurities, water, oildraining;
将阀体拧回原位，前端球阀轻轻打开一点，用压缩空气将排水系统内的杂质、水油排空；
2
The location of the filling device should assure that the oiling operation is safe and reliable, and the technical parameters of draining device should assure the oildraining effect.
注油装置的设置方位须保证注油操作的安全、可靠，排油装置的技术参数须确保排油的效果。
3
In most cases, extracting oil involves chopping down the forest that blankets the region, draining the boggy ground, stripping off the topsoil and literally digging up the oily sand below.