Keep in mind, though, for this test work, you must make sure that your diamond is completely clean and free from oil or dirt.
需要牢记的是，在做这个测试时，你必须保证你的钻石是完全干净且没有沾染油污或灰尘。
什么人都可以做测试吗？
The test work is significant to popularize the common spoken Chinese.
普通话水平测试工作是推广、普及普通话工作的重要举措和手段。
Test work is easy and it can attain the required test accuracy.
检测工作简单并能达到要求的检验精度。
Test work is easy and it can attain the required test accuracy.
检测工作简单并能达到要求的检验精度。
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