此外，完善隐形技术需要时间。

Moreover, perfecting stealth technology takes time.

youdao

那么隐形技术运作的原理究竟是怎样的呢？

How exactly does stealth technology work?

youdao

但隐形技术并不能使得飞机完全隐身。

But stealth technology can't make an aircraft fully invisible.

youdao

Contact lens technology has changed dramatically from the time that I was born to the time that you were born, and the contact lenses you use today are much different than the ones that would have been used 30 years ago.

从我出生,到你们出生的时间段里,隐形眼镜技术发展的很快,你们现在使用的隐形眼镜,与三十年前使用的,已经有天壤之别

耶鲁公开课 - 生物医学工程探索课程节选