有时月球表面会出现小裂缝，而且会有气体从中溢出。
Sometimes tiny fractures appear at the surface, and gas escapes.
穿越表面的一条线，如窄缝、裂缝或皱纹。
表面保护是防止大体积混凝土表面温度裂缝的有效措施。
Surface protection is one of the effective measures for surface crack prevention. of mass concrete.
表面保护是防止大体积混凝土表面温度裂缝的有效措施。
Surface protection is one of the effective measures for surface crack prevention. of mass concrete.
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