Note：PPM means part per million, usually a measure of quality.

注：PPM是百万分之一件的缩写，通常是质量的一种指标。

youdao

The census part cost just over 40 US cents per head.

其中普查部分人均只花费40美分。

youdao

It's advisable to save part of salary per month.

每个月把一部分工资存起来是很明智的。

youdao

It's advisable to save part of salary per month.

每个月把一部分工资存起来是很明智的。

youdao