it became a vapor
它变成了蒸汽
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Earlier after concrete has been poured, curing agent is as if a water evaporating resistance. When a membrane formed, it became a vapor barrier.
在混凝土浇筑后初期，养护剂犹如水蒸发的抑制剂，而随着薄膜的形成，则犹如蒸汽不通过膜。
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