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？
Not bright or vivid. Used of a color.
不鲜明的：不明亮的，不生动的。指颜色。
He is not bright, but he always works hard.
他并不聪明，但工作总是勤勤恳恳。
Beautiful as she is, she is not bright enough.
虽然她很漂亮，她却不够聪明。
I can't do it - I'm not bright enough to succeed.
我做不了——我不够聪明，无法成功。
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。
The results show that I am the judge in question, or not bright graphics.
结果证明我的判断有问题，显卡还是不亮。
The teacher chides him for being unmotivated and assumes he is not bright.
老师就责怪他动机不明确，觉得他不聪明。
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。
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 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。
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。
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。
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。
A short circuit, over current and over heat are short circuit, over current and over heat, and the charging indicator light on the charger is not bright.
电源断电或充电电路出现短路、过流、过热时，充电器上的充电指示灯均不亮。
Chicken called the day will be bright, the chicken is not called days or will be bright, day does not bright chicken said, the problem is the dawn, who woke up?
鸡叫了天会亮，鸡不叫天还是会亮的，天亮不亮鸡说了不算。问题是天亮了，谁醒了？
Their retinal cells are also not excessively sensitive to red components of moderately bright light.
它们的视网膜细胞对中等亮度光线中的红色成分也不太敏感。
He stood thinking, not able to decide, when a bright thought struck him.
他站在那里思考着，拿不定主意，突然有了一个聪明的想法。
I was not feeling very bright that morning.
我那天早上心情不是很欢快。
The streets were hot and dusty on the summer day, and the sun was so bright that it even shone through the haze over Coketown, and could not be looked at steadily.
夏天的街道又热又满是灰尘，太阳是那么明亮，它甚至穿透了焦化镇上空的阴霾，使人们不能稳定地看到它。
We not only want bright students, but also need to attract average students and give them the math skills which are needed to change them into AI designers.
我们不仅需要聪明的学生，还需要吸引普通的学生，让他们掌握成为人工智能设计师所需要的数学技能。
We not only want bright students, but also need to attract average students and give them the math skills which are needed to change them into AI designers.
我们不仅需要聪明的学生，还需要吸引普通的学生，让他们掌握成为人工智能设计师所需要的数学技能。
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