purifying例句
They set up
purifying systems in places where the water was not potable.
他们在许多水质不适合饮用的地方建立了净化系统。
Changing iron into steel is a process of
purifying the iron.
把铁炼成钢是铁的精炼过程.
The extra step would increase the margin of safety by further
purifying the vaccine.
这一步骤将使疫苗更加纯净,从而使它的完全系数得到提高.