V-T To detect something means to find it or discover that it is present somewhere by using equipment or making an investigation. 探测
...a sensitive piece of equipment used to detect radiation.
…一台探测辐射的敏感仪器。
V-T If you detect something, you notice it or sense it, even though it is not very obvious. 察觉
Arnold could detect a certain sadness in the old man's face.
阿诺德能察觉到老人脸上的某种悲伤。
He detected a ship moving down the starboard side of the submarine.
他发现了一艘正沿潜水艇右侧航行的船。
Most skin cancers are completely curable if detected in the early stages.
大部分的皮肤癌若在早期发现都能完全治愈。
Their instruments detected very faint radio waves at a frequency of 3 kilohertz.
他们的仪器探测到了频率为3千赫的非常微弱的无线电波。
"Widespread water has been detected on the surface of the moon."
VOA: special.2009.09.30
So, when the voltage difference between the plates is zero, or when we just don't have the plates there at all, the cathode rays are not bent, they just go right in a straight line, and they can be detected on this screen.
拐弯来测试它们是否带电,当两板之间电压为零,或者根本就,没有这两个板时,阴极射线是一条直线,它可以在屏幕上。
Let's call someting invisible not only it can't be seen, not only it can't be observed, but it can't be detected at all.
让我们把一些不仅是看不见的,不仅是观察不到的,而且是完全检测不到的,东西称为无形的。
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