air course 
[机] 风向
- Private intilted air course makes sure the materials in the girding chamber enter into the mill along the inclined plane.
6、独特设计向内倾斜的风道,确保迸入进风窝壳内的物料能顺利地沿着斜面落入磨机内。 - Birds migrated northward in the course of air pollution.
>由于空气污染,鸟的栖息地移到了山北。 - Of course, the air is very cold, so the ice doesn't melt.
当然,空气寒冷时冰才不会融化。
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