水的纯度定期检测。The purity of the water is tested regularly.要求学生们检验铜的纯度.The students are asked to prove the purity of copper.我们可以保证它的纯度.We can guarantee it pure....
The son had nothing to do with arranging the funeral, but came along to pay his last respects.这个儿子没有参与葬礼的安排,但是来向遗体告别了。It is a cosmetic measure which will do nothing to help the situation long term...这项举措只是表面文章,长期来看对于改善情况...