Think of it this way: if you had three or four pints of blood drained from your body you'd be on life support, very quickly.
打个比方：如果你的身体排出了三四品脱的血液，你很快就需要生命援助。
Simultaneously, the excess activated sludge that drained from the sediment pool returned the hydrolysis- acidification pool could be degraded, so the treatment cost of sludge could be lower.
同时，把二沉池排出的污泥回流至水解酸化池进行污泥减容化，还可以降低污泥的处理成本。
A slug may be placed to ensure that fluids are naturally drained from a tubing string as it is pulled from the wellbore.
段塞的位置应能确保流体在油管柱从井筒中起出时从油管柱中自然地放泄。
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