The water wall wear mainly occurred on the irregular water wall surface in rare phase, the effective measures are promoted in the view above.

循环流化床炉内水冷壁的磨损主要发生在稀相区，主要是由于水冷壁表面结构不规则造成的，并据此提出了防止水冷壁磨损的相关措施。

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At the same time, once the surface water infiltration wall in soil, can be discharged through the masonry quickly, effectively reduce the ground water level.

同时，地表水一旦入渗墙后土中，则可以通过砌体较快地排出，有效降低地下水位。

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The smoother and less choppy the water's surface, the more uniformly high the wall of water will be.

水面越是平稳，水墙将越高，波涛汹涌的水面形成的水墙反倒较矮。

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One thing's clear, however: The artist purposely chose to position each image above a protruding ridgeline that runs along the cave wall, symbolizing either the surface of the water or tall grass that's obscuring the lower half of the deer.

WSJ: Prehistoric but Far From Primitive | Cave Paintings of Lascaux | Field Museum | By Mark Yost