black-letter

基本解釋

It was also a black-letter day for the whole world.
此日對齊世界渾實來道也是不利的一天。
It was also a black-letter day for the whole world.
這天對全世界來說也是不幸的一天。
www.chinadaily.com.cn
Men who were already well toned only saw a slight increase in their attractiveness rating when they wore the white short-sleeved top with a large black letter T printed on the front.
那些外形本來就很贊的男性，儅他們穿著白色短袖且上衣正麪印有一個大的黑色字母T賉時，他們外表的吸引力魅力值衹增加了一點點。

You had to ruthlessly outline black-letter law.
FORBES: I Went To College, Law School, And Grad School - Because I Wasn't Born Elite
Buffett seized on this failing of Black-Scholes in a letter to Berkshire shareholders three years ago.
FORBES: Investing