1)a Polaroid picture,一次成像照片2)once,一次3)bout,一次4)PRY Primary,一次5)at a time,一次6)primary air,一次风，一次空气7)over and over (again),一次又一次;反复8)primary purification,一次精制9)one weighting,一次加重10)primary brine,一次盐水
用法例句
This study was carried on the primary purification of sodium chloride from flotation salt in potassium chloride production in Qinghai salt industrial company.
