一开始水面下降的原因是瓶子首先变热，于是它变得稍稍大了一些。
The reason why the water level went down at first is that the bottle became hot first and so it became a little bigger.
当水池水面下降后，浮球阀重新开启，控制室水压下降，主阀再次开启继续供水，保持液面的设定高度。
When the water tank after falling, floating ball valve to open, the control room pressure drops, the main valve to open again to water, keep the level set height.
自养护剂可以提高混凝土胶凝材料的水化程度，降低混凝土内由于水化反应导致的毛细孔水面下降所产生的压应力，减少了微裂缝的产生。
Autogenous curing agent can improve the hydration degree of concrete, reduce the compressive stress which dropping of water in capillary of concrete caused and sensitivity to cracking.
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