People today know that there are no underground cities on the moon.
现在的人们知道月球上没有地下城市。
No that will be too far.You need to take the underground.
不行喔！那样太远了，你得搭地铁。
No that will be too far. You need to take the underground.
不行喔！那样太远了，你得搭地铁。
There are no structural worries with tubers, which grow underground.
块茎长在地下，根本不用担心头重脚轻的问题。
No extra water enters underground supplies.
没有多余的水进入地下水源。
No extra water enters underground supplies.
没有多余的水进入地下水源。
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