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 insects were examined under magnification.这些昆虫是放大后加以观察的。The magnification is 833,333 times the original size.放大倍数为实物大小的833,333倍。Pores are visible without magnification...毛孔无须放大就可以看见。Pores are visible without magnific...