water level mark
... water-level mark 水位痕 water level mark 水位痕迹 staff with level mark 层线杆 ...
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泥巴一坨一陀的堵住了大门，我们还可以很明显地看到遗留在墙上的水位痕迹。
The mud blocked the front of the entrance piece by piece, and we can still see the trace of water level that the flood left on the wall.
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