The moon was bright, above the eastern hills. Sweet, peaceful stars filled the sky as the night birds sang softly, and tiny insects buzzed in the softair.
月光明亮,平静的群星布满了整个夜空,四周的夜鸟欢快地叫个不停,就连那些小昆虫也不住地低鸣着。
2
Hence, it is significance to discuss the calculating method of the parameters of the softair tube for reasonably designing the air seeder and air machine selection.