fresh gas flow

例句：

1. 1. The freshgas flow is essential for the growth ofplants.
   新鲜气体流动对植物的生长至关重要。
2. 2. Thefresh air flow helps to purify theair in the city.
   新鲜空气流动有助于净化城市的空气。
3. 3. The fresh gas flow is responsiblefor maintaining the balance of the ecosystem.
   新鲜气体流动负责维护生态系统的平衡。