在马丁代克仪表的键盘上可以看到，一排排的信号灯总是在迅速地忽明忽暗。
On the keyboard of Martin-decker, rows of signal lights can be seen switching on and off rapidly all the time.
光信号检测是属于发出光并在暗背景检测强光信号，从而提高了实验灵敏度，拓宽了应用范围，减少了标本用量。
Photo signal test could examine strong photo signals in dark background so that it was able to improve sensitivity of experiments, widen the range of application, and reduce specimen amount.
磁共振中的信号根据所用脉冲的顺序以及所要成像组织的类型分为高信号或第信号(亮或者暗)。
Signal in Mr Images is high or low (bright or dark), depending on the pulse sequence used, and the type of tissue in the image region of interest.
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