The ratio of visible light transmitted through the window to that which is incident upon the window.

太阳光穿过玻璃窗的可见光的数量与投射在上面的之比。

youdao

The emission of electrons from an object when electromagnetic radiation is incident upon it is known as the photoelectric effect.

一个被电磁辐射照射的物体会发出电子，这就是光电效应。

youdao

Standing wave is parasitic effect of exposure, generated by multi reflection and interference of rays vertically incident upon parallel medium layers.

驻波是曝光中的寄生效应，是光线垂直入射到不同的平行平面介质层之间，经多次反射并干涉形成的。

youdao

I landed softly upon the ground, however,without incident.

VOA: special.2010.07.10

"We should not wait for a serious incident before deciding upon an appropriate degree of regulation - not something heavy handed but something recognising that both the frequency and size of these huge commercial cycling events have greatly increased, " he said.

BBC: New Forest cycle event organisers 'baffled' by criticism

By all accounts, the incident began after soldiers from the company were fired upon.

CNN: Army tapes reveal motive in Iraq prisoner killings

As regards this particular incident, we will work in the manner that I described to you to call upon Iran to release Mr. Hekmati immediately.

WHITEHOUSE: Press Briefing