In normal tissues has good elasticity, pressure after soon restore original shape and color.
正常组织的弹性好，压过后很快即恢复原有的形状及色泽。
With the pressure increasing, the upper plate would spring back to its original place.
随着压力的增强，上面的板快反弹回来原来的位置。
Constant power water: tap water recovery after power failure the original water pressure as usual.
停电不停水：停电后仍恢复自来水原有压力照常给水。
Constant power water: tap water recovery after power failure the original water pressure as usual.
停电不停水：停电后仍恢复自来水原有压力照常给水。
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