This paper discussed the mechanism of forming black film of the blackening system at room temperature on steels in the mixture solution of copper salt and selenious acid, and the influence factors for blackening film.

So where does the name "Black Friday" come from?

那么“黑色星期五”这个名字从何而来呢？

The day after it has been known as Black Friday.

后一天被称为黑色星期五。

Black Friday is a great time to go shopping.

黑色星期五是购物的好时机。

Now people all over the country take part in Black Friday events.

现在全国人民都参加黑色星期五活动。

A fortnight later, when the snow had gone, and had been followed by a hard black frost, she took advantage of the state of the roads to try the experiment.

两个礼拜以后，风雪过去了，接着又是一场严酷的霜冻，她就利用道路冻住了的时候去进行这次拜访。

On that bleak hill top the earth was hard with a black frost, and the air made me shiver through every limb.

在那荒凉的山顶上，土地由于结了一层黑冰而冻得坚硬，冷空气使我四肢发抖。

Your portrayal of the Black Knight ghost was inspirational to my brother and me.

你的关于黑骑士鬼的描述是对我和我兄弟的鼓舞。

The Black Knight casts Death's Respite on the herald, killing him.

黑骑士对使者施展索命咒，做了他。

He walked up to a black knight and put his hand out to touch the knight's horse.

他走到一个黑骑士身旁，伸手摸了摸骑士的马。

He think the black knight is a wraith.

他觉得那黑骑士是个亡灵。

I challenge you to mortal combat, black knight!

我向你挑战到不免一死的战斗，黑色的骑士！

Have you ever seen this Black Knight before? I don't believe, sir.

以前见过这位黑骑士吗？我想应该没有。

Instead, Whitman becomes a hero known as Black Knight.

他饰演的戴恩·惠特曼成为了英雄“黑骑士”。

Some reckon firms are over-invoicing for exports to ship black money back into the country.

有些人猜想一些公司在虚报出口好把黑钱运回来。

The discussion of the function of anti-cleansing black money has its practical significance under the financial supervisory system.

在我国金融监管体制改革的时代背景下对金融机构反洗钱职能的探讨具有现实意义。

International speculative capital originate from: private capital, hedge fund, bank, international black money.

国际投机资本的来源所有四个方面：私人资本、对冲基金、银行资金、国际黑钱。

All the black money here turns white there.

那里所有黑钱都被漂白了。

This system is calibrated using a blackbody furnace as standard temperature source. The relationship between flame temperatures and grey level of the images is established through image processing and function correlation.

借助黑体炉等标定源，利用温控系统提供温度参数，经CCD系统成像得到图像的灰度值，通过函数拟合获得辐射图像灰度与温度之间的关系。

It is shown that the radiation spectrum is consistent with a perfect blackbody spectrum in the Hawking temperature.

结果表明，辐射光谱在Hawking温度下是一个完美的黑体辐射谱。

An Ammonia/ Stainless Steel Heat Pipe Blackbody Radiation Source

氨/不锈钢热管式标准黑体辐射源