Regular repeating actions such as sound waves, light waves, or radio waves have a certain frequency, or number of waves per second.

有规律的重复活动如声波、光波、无线电波都有一个特定的频率，或者说是每秒的波动次数。

《柯林斯英汉双解大词典》

The second problem is that Venus exhibits a halo of light when it is seen just outside the Sun's disc.

第二个问题是，当金星在太阳圆盘外被观测到时，它会呈现出光晕。

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The devices, which register depth and light every second, were taped to the lower back, so that they caused the least amount of drag.

这种可以每秒钟记录深度和光线的装置被固定在企鹅的背上，以将阻力减到最小。

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They had a slightly larger yard than most of their crammed-in neighbors, so they had closed it off with sheets of rusty corrugated metal, and there, at four long wooden tables beneath a string of light bulbs which dangled from a second-story clostra-block window, they served up to thirty customers per night, if the turnover was fast.

NEWYORKER: Ghosts

But after Broad had sent down a wide and two legitimate deliveries - the second of which trapped Denesh Ramdin lbw - the batsmen were offered the light, and Dyson beckoned his batsmen into the pavilion.

BBC: England win after farcical finish

Wait a second, I see a flashing light -- I see one, and it looks like -- yep, yep, the light is Santa.

WHITEHOUSE: The White House