从中可得到菲涅耳衍射区的许多特性。

It is shown that many properties of diffraction in the Fresnel region can be obtained.

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通过细丝后在其后菲涅耳衍射区留下阴影，测量阴影宽度可得细丝直径；

The diameter of a thin wire was obtained by measuring the shadow in the Fresnel diffraction zone.

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运用离子选择性电极（ISE）和X射线衍射分析（XRD）方法，对云南昭通威信地方病氟中毒区的氟源进行了研究。

The sources of the endemic fluorosis in Weixin, Zhaotong of Yunnan Province has been studied using an ion selective electrode(ISE) and X-ray diffraction analysis(XRD).

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