The one in Punjab has fallen from a couple of metres below the surface to, in parts, hundreds of metres down.
旁遮普邦的一处地下水下降了好几米，从地上算，已经是百米以下。
Communities of microorganisms have been found hunkered down in groundwater as far as 5 km below the surface of the land.
地表之下5公里的地下水中也发现了微生物群落。
You are only able to see above the surface of their spending, meaning you have no idea what's happening down below.
你只看到他们表面上花钱的情况，不知道人家在你看不到的地方过什么样的日子。
In a marsh, the surface water can sink slowly down through the soil into the rock below.
在沼泽地里，地表水会通过土壤慢慢地渗透到下面的岩层里。
It can dive down as far as 200 metres below the surface and directs itself by shifting a weight from fore to aft.
最多可以潜入水面200米，通过把船头重量转到船尾拉自我导向。
It can dive down as far as 200 metres below the surface and directs itself by shifting a weight from fore to aft.
最多可以潜入水面200米，通过把船头重量转到船尾拉自我导向。
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