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。

youdao

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》

Though it is weak, light is reborn from the darkness to our natural and psychic worlds.

尽管微弱，光线还是从黑暗中重生，回到我们的自然世界和精神世界。

youdao

In those last years, when my life seemed to have been shrouded in an invisible damp mist, she was the torch by whose weak and gentle light I could guide my steps.

NPR: Excerpt: 'Esther's Inheritance'

In it, he uses eye drops made of a special riboflavin (a type of vitamin B) formulation and a very weak ultraviolet light to strengthen the collagen fibers in the eye.

FORBES: A New Hope for Those With Down Syndrome...And a Rare Eye Disease

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

NEWYORKER: Pumpkin Head