Assitant, please let the customer to try on this coat.

营业员请那位顾客试穿一下这件大衣。

The water hydraulic transmission is the popular research topic in the field of the liquid transmission, while the filter is an important assitant device in the water hydraulic system.

水压传动是流体传动领域的研究热点， 过滤器在水压系统中是非常重要的辅助元件。