塔顶的菲涅尔透镜。透镜的厚度和质量令人印象深刻。
Fresnel lens on the top. Thickness and quality of the glass are impressive.
透镜的厚度和质量令人印象深刻。
这种薄膜的厚度只是普通纸的一半，可是质量相当好。
Thiskind of film is twice thinner than ordinary paper, but its quality is quitegood.
实验验证，通过改变切割速度提高变厚度工件的切割质量是可行的。
The result demonstrated that the way of adjusting cutting speed is obtained.
实验验证，通过改变切割速度提高变厚度工件的切割质量是可行的。
The result demonstrated that the way of adjusting cutting speed is obtained.
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