It was found originally that environment atmosphere could effect the entrained air content of concrete.
首次发现环境气压能够影响混凝土的含气量。
Water vapor content in the air a lot.
空气中的水蒸气含量变化很多。
Kuanyin Mountain Forest Park all year round fresh air, fine spring high negative ion content.
观音山森林公园一年四季空气清新，鸟语花香，负离子含量极高。
Kuanyin Mountain Forest Park all year round fresh air, fine spring high negative ion content.
观音山森林公园一年四季空气清新，鸟语花香，负离子含量极高。
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