Fat of animal and vegetable oils for the release agent problems are more due to air-containing products of more emulsifier and thickener, surface concrete structure will be greatly affected.

动植物油进行脂化的脱模剂出现的问题较多，其原因是产品中含有引气性比较大的乳化剂及增稠剂，会给混凝土结构面层带来极大的影响。

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Security experts feared someone might be able to release a biological agent into the air stream that flows into the building, sources said.

CNN: U.S. Capitol getting security overhaul