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。
Is it too bright or not bright enough?
是太亮还是不够亮呢？
He is not bright, but he always works hard.
他并不聪明，但工作总是勤勤恳恳。
The Apollo landings took place during lunar mornings so the stars were not bright enough to be captured on camera.
阿波罗登陆的时间对于月球来说是早上，所以星星没有那么明亮，相机也很难捕捉到。
Kang Jingdong, an analyst with Cinda Securities, said the outlook for acquisitions like this one was not bright for the industry.
信达证券分析员康敬东说，这次收购对于本行业来说前景并不乐观。
Beautiful as she is, she is not bright enough.
虽然她很漂亮，她却不够聪明。
The rice is red but not bright, nice and slender.
其米红而不艳、清秀细长。
Though big cats are strong and powerful, their future is not bright.
虽然大型猫科动物强壮、有力，然而它们的前景并非一片光明。
Oriental not bright western bright, dark north with the south. God closes a door, will open a window.
东方不亮西方亮，黑了北方有南方。上帝关上一扇门，总会打开一扇窗。
Its light was not bright, and it was diffused by the mist, but the man Jack would not need much light.
月光并不明亮，更因薄雾的笼罩而变得迷蒙，不过杰克并不需要太多的光。
The sun is also absolutely different here. It is not bright, like in a haze, and colors everything around in yellow.
这里的太阳也完全不同往常，它并不耀眼，像被雾气笼罩一般，并且会把所有的一切都染上黄色。
Maybe some manufacturers still don't understand why his lamp is not bright, still kicking ballasts have problems, or tubes have problems.
可能有些厂家还不明白为什么自己的灯管装上后不亮，还在怪镇流器有问题，或者是灯管有问题。
Earlier this year, the prospects for the euro area's economy seemed, if not bright, then less dim than for some other parts of the rich world.
在今年的早些时候，虽然对于欧洲经济的预期即使看起来不是很明朗，但是也不比其他富裕国家来的黯淡。
Not bright or vivid. Used of a color.
不鲜明的：不明亮的，不生动的。指颜色。
Not bright and clear in color; somewhat dull or drab. Often used in combination.
不鲜明的，不纯净的：色彩不鲜明的和不纯净的；略显暗淡的，略显单调的。常用于合成词。
What's worth taking away: the statement jewellery. What's not: bright colours look great on TV but may be too distracting for some offices.
应该学习的： 有个性的珠宝。不应该学习的：明亮的色彩在电视上很好看，但是在某些办公室里就太让人分心了。
What's worth taking away: the statement jewellery. What's not: bright colours look great on TV but may be too distracting for some offices.
应该学习的： 有个性的珠宝。不应该学习的：明亮的色彩在电视上很好看，但是在某些办公室里就太让人分心了。
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