1. 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。
2. 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。
3. direct frequency conversion circuit 
   直接变频电路
4. frequency and duration method 
   停电频率和持续时间法
5. frequency division multiplex communication 
   频分多路通信

查看更多例句 相关情景会话