black-letter day

The merging osteoblasts were found from passage culture on day 7, and there were apparent mineralized nodules on day 14. Von kossa and Alizarin red staining showed positive with jacinth and black respectively.

传代后第7d即可汇合，第14d出现矿化结节，茜素红染色呈橘红色，VOn Kossa染色呈黑色；

I have a dream that one day down in Alabama with its governor having his lips dripping with the words of interposition and nullification, one day right down in Alabama little black boys and black girls will be able to join hands with little white boys and white girls as sisters and brothers.

我梦想有一天，阿拉巴马州能够有所转变，尽管该州州长现在仍然满口异议，反对联邦法令，但有着一日，那里的黑人男孩和女孩将能够与白人男孩和女孩情同骨肉，携手并进。

It was also a black-letter day for the whole world.

这对全世界来说也是不幸的一天.

Single's Day, a discount online shopping day promoted by Alibaba, is the equivalent of Cyber Monday and Black Friday in the US. It falls each year on November 11.

每年11月11日的光棍节是阿里巴巴推出的在线购物打折日，相当于美国的“网购星期一”（Cyber Monday）和“黑色星期五”（Black Friday）。

On your black letter day, nothing will go your way.

在你不走运的时候, 事事都不顺心.

The waterwheel came to a stop with a creak and Scabby-headed Xue saw Black-browed Zhao gazing at him with a foolish smile. He felt dazed as if she were not the Black-browed Zhao he met day in and day out, but rather Chang Er, the Moon Fairy coming down from the moon.

水车“吱格”地停住，雪癫子转过身来，只见“招白眼”傻乎乎地笑，雪癫子也懵了，好像眼前不是日日开门相见的“招白眼”，而是从月亮上飘下来的嫦娥。

The day Poland was invaded was a black-letter day for the world.

波兰遭到侵犯的那天,封全世界而言是不幸的日子.

I have watched day after day these black, tense faces that have crowded this court.

日复一日,我注视着挤满了这个法庭的一张张乌黑 、 神情紧张的面孔.