Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
I like to see a job done quickly.
我喜欢速战速决。
Faith will move mountains.
精诚所至，金石为开。
sometimes with the local priest (who was usually as poor as his parishioners), sometimes with shepherds or cheese-makers.
有时同当地牧师 （他通常和他的教民一样穷）住在一起，有时同牧羊人或制乳酪的人住在一起。