在四环高架桥下，你穿过十字路口向左转，沿路走到河流消失在四惠桥下的尽头。
Once under the elevated 4th Ring, you cross and turn left to follow the road round to where a stream vanishes under the Sihui Bridge.
它们与地球上的河流系统非常相似，地质学家认为它们是早已消失的河流留下的干涸的河床。
They bear a strong resemblance to river systems on Earth, and geologists think that they are dried-up beds of long-gone rivers.
尽管一些河流被重新殖民，但原始种群的独特基因已经消失。
Although some rivers have been recolonized, the unique genes of the original populations have been lost.
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