Many complain that they live in fear of being detected by the government and arrested.

VOA: standard.2009.11.14

There' s a way in which you can talk about it being detected by its effects.

有办法可以通过,它产生的影响判断能否发现它。

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You turn on your radio, the radio waves passing by, boom, properly tuned, you detected it.

你打开收音机，无线电波传出来，好好地调试一下，你就检测到它了。

耶鲁公开课 - 死亡课程节选

But is it still invisible if by invisibility we mean can't be detected?

但是如果无形是指不能检测,灵魂还是不是无形呢？

耶鲁公开课 - 死亡课程节选

It can't be detected at all by the five senses.

五种感官都不发现不了。

耶鲁公开课 - 死亡课程节选