black letter

基本解释

Last Friday, a black letter day, he had a car accident.
上个星期五，一个倒霉的日子，他出了车祸。
In big black letter I write my name on them and the name of the village where I live.
用又粗又黑的字体我在纸船上写上自己，还有我所住的村庄的名字。
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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.
那些外形本来就很赞的男性，当他们穿着白色短袖且上衣正面印有一个大的黑色字母T恤时，他们外表的吸引力魅力值只增加了一点点。

Yellow or brown areas shaped like the letter V on leaves may be a sign of black rot infection.

Having said that, howsabout we now turn to the tedious task of examining the black letter law of forgery?
FORBES: Line Between Signature And Forgery Trips Up Former Wells Fargo Broker
This black letter rule to stop drug dealer tax deductions also covers medical marijuana since federal law still classifies it as a controlled substance.
FORBES: Voters Say Yes To Marijuana, IRS Says No
You had to ruthlessly outline black-letter law.
FORBES: I Went To College, Law School, And Grad School - Because I Wasn't Born Elite