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。
Not bright or vivid. Used of a color.
不鲜明的：不明亮的，不生动的。指颜色。
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。
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。
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。
As a bright and caring young man, Gabriel tries hard to not only be a barber, but also make a connection with the neighborhood.
作为一个聪明而有爱心的年轻人，加布里埃尔不仅努力成为一名理发师，还努力与社区建立联系。
Although my camera did not quite capture how bright and colorful it was in person, I still like the photo.
尽管我的照相机无法完全拍摄到它的明亮和彩色，我仍然喜欢这张照片。
Teachers should also try not to use projectors or other multimedia equipments that are too bright, Beijing Daily reported.
据《北京日报》报道，教师还应尽量避免使用过于明亮的投影仪或其他多媒体设备。
In order not to lose those very important points, you can use some bright, fun color signs to record these materials.
为了不丢失那些非常重要的点，你可以使用一些明亮、有趣的颜色标志来记录这些材料。
This colour is bright but not garish.
这颜色艳而不俗。
Possibly not, but that is where two bright emission nebulas nicknamed Heart and Soul can be found.
也许不是，但那儿能看见两个明亮的发射星云昵称心与灵的发射星云。
This star is clearly not the pulsar as it is about equally bright on both exposures.
这颗星很明显不是，中子星，因为它几乎,在两次曝光中一样亮。
Synthetic fibers which will not fade can be produced in bright colors such as pink and purple in addition to all the other colors of the rainbow.
不褪色的合成纤维会以粉红色和紫色等各种鲜艳的色彩制造出来，而且是和彩虹的各种颜色一起吧。
Not only do the bright paints make the dying trees prettier, but they also add an unusual element to the desert landscape that is impossible to miss.
他们不仅仅是用鲜亮的色彩来彩饰那些奄奄一息的树，使其更充满活力，而且也为不容忽视的沙漠景观增加了一些不一样的元素。
But not his eyes. His eyes were young and bright, their weapons-grade intensity intact.
但他的眼睛仍然是年轻而明亮的，他们武器级的强度不变。
Ants may not be very bright, but it seems they have a head for figures.
蚂蚁也许并不太聪明，但似乎天生就是算术高手。
You can get a proper exposure for shadows, or propper exposure for bright areas, but often, not both, and that can be a good thing.
你可以为暗部获得适当的曝光，或者为亮部获得适当的曝光，但通常你无法两者兼得。
You can get a proper exposure for shadows, or propper exposure for bright areas, but often, not both, and that can be a good thing.
你可以为暗部获得适当的曝光，或者为亮部获得适当的曝光，但通常你无法两者兼得。
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