Think green city is very important, because the green plants, not only can beautify cities, still can purify air, give a person with fresh air.

觉得绿化城市很重要，因为绿色植物多了，不仅可以美化城市，还会净化空气，给人以新鲜的呼吸空气。

youdao

Any air filter can use one (or more) of three different techniques to purify air.

任何空气过滤器都会采用下述三种空气净化技术的其中一种(或多种)。

youdao

The woman can easily strap it over her nose and mouth "to help purify the inhaled air, " reads the report, "while keeping her hands free, " presumably to fend off unwanted suitors.

报告上说道：“女士们可以轻而易举将它套在口鼻上而将双手腾空出来，”目的也许可以用来挡开那些咸猪手。

youdao