Set up system to provide a "cross flow" of intake and exhaust ventilation wherever possible.
在任何可能的地方建立通风系统用以保证进风和排风的的交叉流动。
"The sea cross-flow, the hero".
“沧海横流，方显英雄本色”。
The product includes check valve to prevent cross-flow ;
配置止回阀，防止逆流；
The product includes check valve to prevent cross-flow ;
配置止回阀，防止逆流；
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