The earth needs 24 hours to turn round once and get back to its starting place with the sun.
地球需要24小时才能转一圈，回到相对于太阳的起始位置。
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.
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。
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