1. The ratio of the size of an image to the size of an object. 
   放大率图像的尺寸和实物尺寸之间的比率
2. The ratio of the width to the height of an electronic image. For broadcast television, the standard aspect ratio is4∶3. 
   一幅电图象的长宽比。广播电视的标准是4∶3。
3. using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth. 
   利用高频率的声波反射情况形成身体器官的图像（语图）；通常用来观察胎儿的发育状况。
4. an image of a structure that is produced by ultrasonography (reflections of high-frequency sound waves); used to observe fetal growth or to study bodily organs. 
   被超声波检查法（高频率的声波的反映）生产的一个结构的图像；过去常常观察胎儿的发展或者研究身体的器官。
5. direct frequency conversion circuit 
   直接变频电路

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