fire in air ; inflight fire是什么意思

用法例句

Developed a high-powder,efficient and practical air powder vacuum cleaner after studing its working principle in order to suck up air powder,the vacuum cleaner is vevy practical.

通过对吸尘器工作原理的学习,研究出一种大功率高效实用的空中粉尘吸尘器,用来吸掉空中的粉尘,这种吸尘器实用性很强。