形 pure，unmixed，simple，pure and simple；

[例句] 去年，这个集团的纯利润率为30%。 The group had a net profit margin of 30% last year.

[例句] 与纯电动汽车不同，混合动力车永远不需要接电源。 Hybrids, unlike pure electric cars, never need to be plugged in.