This paper briefly introduces the sealing principle of the screw sealing feed water pump, and deals with its frequent trip problem arising from inadequate pressure difference of seal water.

在对螺旋密封式给水泵的密封原理作简要介绍的基础上，针对其因密封水压差小而导致频繁跳泵的问题进行了讨论。

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Hwang Min-woo, a 28-year-old South Korean who contributed to the North Korea map, said he began working on it after trying to use Google Maps on a trip to Laos four years ago and finding it inadequate.

WSJ: Google Maps Details Streets, Prison Camps in North Korea