Drying machine of the filter before adding the automatic device should be drainage.
干燥机之前的过滤器应加装自动排水器。
The successful development of this drilling machine provided reliable safety equipment for coal mines to practise gas drainage technology by long holes.
钻机的研制成功为煤矿实施长距离钻孔抽放瓦斯工艺提供了可靠的安全装备。
The drawbacks are acacia's low drainage rate and low initial wet web strength, which are bottlenecks to the high paper machine speed especially at the web forming.
需要改进的地方是：它的滤水速率和湿纸幅强度较低，这些将是现代高速纸机湿部的瓶颈所在。
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