嘴唇颜色比较暗，发黑的原因？
显影后，入射光就在表层产生了发黑的银粒子。
After development, incoming light produces blackened silver granules in the layer.
阐述了黄铜氧化发黑的原理，介绍了发黑液的配制。
The fundamental of blackening of brass by oxidation was described.
通过改进密封函填料配方解决了活塞杆过热发黑的问题。
The problems such as overheat and blackening of the piston rod are solved by means of improving the composition of packing in the sealing box.
飞机作这样的急速下降本来是会使缺乏经验的人眼前发黑的。
A steep descent in an airplane like this would have blacked out a fledgling.
房门左边有一块发黑的地板，上面放着一个臭气熏天的木桶。
By the door to the right there was a dark spot on the floor on which stood a stinking tub.
详细介绍了钢铁常温发黑的原理、配方、工艺过程及常见故障的排除。
The fundamental of blackening process as well as its formula, procedure and trouble-shooting cases was described in detail.
因为她的皮肤还是雪白的，她的脸颊还是玫瑰红色，她的头发黑的像乌木。
For her skin was Snow White, her cheeks rosy red, and her hair black as ebony.
他粗糙的双手，被太阳哂得发黑的健壮四肢，均表明他十分辛勤，非常耐劳。
His harsh hands and sinewy sunburnt limbs show labor and endurance.
这之后很快王后就拥有了一个女儿，她很白，有着红润的脸颊，头发黑的像乌木；
Very soon after this the queen had a little daughter who was very fair, had rosy cheeks, and hair as black as ebony; and they gave her the name of Snow-white.
报道了铜制品表面常温发黑的新工艺，介绍了发黑剂的组成、作用和使用方法。
A new process of room temperature blackening of copper product surface is described. The composition, function and use method of the blackening solution are presented.
本文对发黑物的化学成分、发黑原因、对电机的影响及防止发黑的方法作了一些探讨。
In this article, we make a general study of chemical component of the black substance, the reason of turning black, its effect on the motor and way to prevent the phenomenon.
他们身后是自家面包店烧得发黑的烤炉，这是他们家中在海啸中唯一幸免遇难的唯一物件。
Behind them is the blackened oven of the family's bakery. It was the only item to withstand the force of the tsunami.
她看起来就像是睡着了；因为她的皮肤还是雪白的，她的脸颊还是玫瑰红色，她的头发黑的像乌木。
It seemed as if she slept; for her skin was Snow White, her cheeks rosy red, and her hair black as ebony.
它的午餐和晚餐菜单包括汤，沙拉，三明治以及发黑的虾面，鸡肉芝士等主菜，和烤箱烤青椒辣椒。
Its lunch and dinner menu include soups, salads, and sandwiches as well as such entrees as blackened-shrimp pasta, chicken Parmesan, and oven-roasted stuffed poblano peppers.
门口并没有挂什么“美国饭店”的招牌，和别人家一样，堆着一堆发黑的柴禾，拉着一根晾衣裳的绳子。
In front of the door, there was no signboard of America Hotel hung, it was the same as other house, there was a heap of nigrescent firewood, and a washing line for drying clothes.
叙述了金属化后碳元素引起真空开关管管壳瓷釉发黑的机理，指出了各种工艺参数对釉面发黑的影响及其解决办法。
This paper has been mentioned blacking of ceramic glaze of Vacuum interrupter by carbon element, It points out blacking is affected by several technology parameters and blacking problem is settled.
原来白色的铅颜料已经氧化发黑了。
The original white lead pigments have oxidized and turned black.
他气得脸色发黑，但他看到他们说的是实话，吃了一惊。
His face had gone black with rage, but he saw that they believed their words, and he was startled.
当他把药递给下一个赶狗人时，香农的脸冻得发黑。
When he handed the medicine to the next musher, Shannon's face was black from the extreme cold.
凌晨时我被疼醒了，腿疼的厉害，腿和脚都开始发黑了。妻子送我去医院后，医生警告说，有可能要截肢。
By the time my wife got me to hospital, my leg was going black and the doctors were warning me they might need to amputate it.
你不需要非得等到被打到骨折或眼发黑时才认为那是虐待，喊叫，谩骂，威胁和恐吓等都是虐待的表现形式。
You don't have to wait for broken bones or a black eye before you consider it abuse. Yelling, name-calling, intimidation and threats are all forms of abuse.
计算机科学家罗伯·费格斯当时正坐在波士顿一家灯光昏暗的酒吧里，突然一阵强光闪耀，照得他眼前发黑——原来是一个朋友拍照时照相机闪关灯发出的光。
Computer scientist Rob Fergus was sitting in a dimly lit Boston bar when a sudden burst of bright light blinded him-the camera flash accompanying a friend's photograph.
看看我的眼睛都浮肿了，眼袋发黑，松弛，而且布满了皱纹和黑眼圈。
Look at my eyes, they're puffy, and my eye bags, they're dark and loose and full of lines and circles.
我看见一些树的叶子因病害而发黑。
葡萄园里的葡萄已经紫的发黑，跟黑珍珠一样，吃到嘴里酸酸甜甜，让人忘不了那味道。
Vineyard vines have purple black, like the black pearl, to eat into his mouth a sour, sweet, let a person forget the taste.
简要介绍了黑色食品中的营养与功能因子、生理功能研究概况，提出以中医理论为指导，吸取生命科学的最新成果来开发黑色食品。
This paper states nutrition and function factors of black food and their physiological functions, proposing to develop black food based on herbalism and the latest outcomes of life science study.
简要介绍了黑色食品中的营养与功能因子、生理功能研究概况，提出以中医理论为指导，吸取生命科学的最新成果来开发黑色食品。
This paper states nutrition and function factors of black food and their physiological functions, proposing to develop black food based on herbalism and the latest outcomes of life science study.
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