If you swim in a river or lake, be sure to investigate what is below the water surface.
如果你在河里或者湖里游泳，一定要弄清楚水面下有什么。
Weihe river is the biggest river and principal surface water source in Guanzhong Basin.
渭河是关中地区最大的河流，是该地区主要的地表水水源。
Objective To investigate the mutagenicity of Q river surface water.
目的为了调查Q流域地面水致突变性。
Objective To investigate the mutagenicity of Q river surface water.
目的为了调查Q流域地面水致突变性。
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