Green campaigners say refrigeration or dry ice is a good alternative to formaldehyde, which can seep into the water system.
绿色倡导者称冰箱或干冰都是容易渗入水系统中的甲醛的很好替代物。
The refrigeration process of these products will not produce as much gas as dry ice. In this way, the products are not restricted by the air shipment. It is an ideal replacement for dry ice.
制冷过程不会像干冰那样产生大量气体存在安全隐患，因此不受航空限制，是干冰的理想代替品。
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