Cement concrete, formed with cement, coarse and fine aggregates and water in appropriate proportion before a period of hardening, is a sort of stone material.
水泥混凝土是由水泥、粗集料、细集料和水按适当比例配合，经一定时间硬化而成的一种人造石材。
Leather Watchband is needless to say, sweat corrosion can cause premature hardening of belt cracking, normal maintenance should avoid sweating the wet period wear belt table.
皮表带就更不用说了，汗渍的腐蚀会使皮带过早硬化开裂，正常保养应该避免多汗多雨时期戴皮带表。
B. Maintain rammed earth with minimal moisture loss at relatively constant temperature for period necessary for hydration of cement and hardening of rammed earth.
在相对稳定的温度下，确保夯实墙的最小湿度，以保证水泥的水化和夯实墙的硬化。
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