Usually there is only one or two a year bright enough to be seen with the naked eye.

通常，一年只有一到两颗彗星明亮得肉眼可见。

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This is because their colors are not bright enough to be noticed by the human eye.

这是因为它们的颜色不够明亮，无法被人眼注意到。

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Is it too bright or not bright enough?

是太亮还是不够亮呢？

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But how do you get to Uriah Parmelee, a kid from Connecticut, obviously bright enough or connected enough to get into Yale, who gave all that up for something he saw as a lot higher?

你们该如何理解乌利亚·帕米利,一个从康乃狄格农村来的小孩,很显然,要么聪明绝顶,要么家族显赫,他放弃一切,追求至高

耶鲁公开课 - 美国内战与重建课程节选

Screens are designed to be bright enough for poor but very sunny parts of the world.

BBC: Nokia is off the burning platform - can it reach shore?

KELT-2Ab orbits the bigger star, which is bright enough to be seen from Earth with binoculars.

MSN: Newly discovered alien planet 'resets the bar for weird'

Big enough to lose myself in, bright enough to dazzle me with tales of warfare, romance and spies.

WSJ: The Hobbit | A Middling Middle-earth