Unless smokers are consistently located near more hospitable warm-water vents, chemosynthesis can account for only a fraction of the vent faunas.

除非烟囱始终位于更适宜的暖水喷口附近，否则化学合成只能占喷口动物群的一小部分。

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Then they climbed out of the vent, onto the roof, and down 50 feet of piping to the ground where a makeshift raft made from raincoats took them across 1.5 miles of water to San Francisco.

然后从通风口爬到房顶上，再沿着管子下滑50英尺到达地面，到达地面后，用雨衣做了个临时的小船，顺水漂了1.5公里后，终于到了旧金山。

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And, when you fill the tank again, water will reach the top of the tank and overflow through this vent pipe.

而当你又注水进水箱的时候，漫过箱顶的水就从这个溢水管溢出。

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These valves use a screw type valve instead of a simple flap, and they have a pressure regulating mechanism that will vent water to the ground if the intake pressure exceeds a set level.

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