it freezes短语⁶⁶⁵⁹⁶ 例句 Air-entrained concrete contains billions of microscopic air cells. These relieve internal pressure on the concrete by providing tiny chambers for the expansion of water when it freezes. 在引起混凝土中有成千上万的微气孔，这些微气孔为内部的水冻结时产生的膨胀提供了微小的空间，从而减少混凝土内部压力。 c-bm