For example, in a relatively closed environment, the focus for generations of a family home.
比如，在一个相对封闭的环境里，世代集中居住着一个大家族。
Closed system, negative pressure operation, no dust emissions, a good operating environment.
系统全封闭，微负压操作，无粉尘飞扬，操作环境好。
Closed system, negative pressure operation, no dust emissions, a good operating environment.
系统全封闭，微负压操作，无粉尘飞扬，操作环境好。
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