Objective: To explore ultrasonography as the rapid and accurate method in the diagnosis of intrauterine growth retardation (IUGR).

目的：探讨超声对胎儿宫内发育迟缓(IUGR)的快捷、准确的诊断方法。

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It also introduces the method to settle the transfer problem of the polarization state using the transfer function when polarized light passes through retardation sheet.

介绍了描述光波偏振态的复平面法，提出了在复平面上利用偏振传递函数解决偏振光通过延迟器件的偏振态变换问题。

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Put forward a new method of assembling polarization-interference to measure the phase retardation of wave-plate.

提出了会聚偏振光干涉法测量波片相位延迟量的新方法。

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