There always are some semi dynamic objects in virtual scenes for enhancing realistic immersion, such as trees, flame and smoke.

为了增强视觉沉浸感，虚拟场景中存在着大量的树木、火焰、烟尘等半动态对象。

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Model BQJ-1 Semi-automatic Water-bath Test Tank for Aerosol Cans Capacity:Counted by each can immersion in water for two minutes.

BQJ-1型半自动气雾剂水浴检测槽 生产能力：以每罐在水中浸泡三分钟计算。

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