Which aspects should be invisible to other classes?

哪些部分应该对其他类不可见？

youdao

But like the wires in the walls, these hundreds of computers will come to be invisible to common awareness.

但是就好像墙壁里的电线一样，这上百台计算机在常识上是看不见。

youdao

AJAX is great for some jobs, but don't over-use it or your site will be invisible to Google's ranking system.

AJAX在完成某些工作上很出色，但别过分使用它，否则你的站点就会被Google的排名系统抛弃了。

youdao

Sam Sedaei says that identity is like an invisible man, and for him as an Iranian American, a coherent identity can be even more difficult to see.

VOA: standard.2010.06.15

You don't get the more modest conclusion invisible things can't be destroyed or it's a whole lot harder to destroy them.

不是得出个更谦虚的结论,无形的东西不会毁灭或者,要毁灭它是不容易的。

耶鲁公开课 - 死亡课程节选

All that Simmias needs to cause problems for Socrates' argument is the claim that harmony is invisible and harmony can be destroyed.

西米亚斯为苏格拉底的论证,带来问题的只需要是,和声是无形的,但是可以毁灭。

耶鲁公开课 - 死亡课程节选

You not only tried to keep a low profile, you tried to be invisible to the media.

FORBES: Dow Jones Interactive

It is particularly dangerous as it can be invisible to drivers.

BBC: Wiltshire black ice causes 55 road accidents

An aeroplane shrouded in such kit might be invisible to the human eye but it would be picked up readily by radar, which operates at radio wavelengths.

ECONOMIST: How to weave a cloak that makes you invisible