Horseshoe crabs kept in the dark continuously for a year were found to maintain a persistent rhythm of brain activity that similarly adapts their eyes on a daily schedule for bright or for weak light.

人们发现，连续一年被关在黑暗的环境中的鲎仍然可以保持稳定的大脑活动节奏，这种稳定的节奏也使得它们的眼睛适应每日或明或暗的光线。

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Radio wavelengths are much longer than those of visible light, and the radio waves from deep space are always weak.

无线电波的波长比可见光长得多，而且来自深空的无线电波总是很弱。

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To his surprise he didn't feel too weak. Light-headed certainly, and with a sense of unreality, but able to walk.

令他惊讶的是，他并没有感觉太虚弱，虽然头晕，并有些不真实感，但能走路。

《柯林斯英汉双解大词典》

Unlike electromagnetic waves - the light seen by traditional telescopes - gravitational waves are extremely weak.

BBC: Lab tuned to gravity's 'ripples'

When ECB President Mario Draghi was asked if the central bank would increase its sovereign bond-buying in light of weak auctions across the euro zone, he said no.

FORBES: Stocks Battered As Words From EU Meetings Alarm Investors

It did not seem to her a natural light, and in weak moments she thought, This is the crossing-over time.

NEWYORKER: Pumpkin Head