The business-letter format is very important for communicating formally with a company.

商务信函的格式在与公司的正式交流中意义重大。

youdao

The letters must be handwritten in Portuguese using blue or black ink ballpoint pen, with up to 800 words in letter format.

UNESCO: OFFICE IN BRASILIA

Letter Box format is actually meant for widescreen movie theaters but a lot of people want the same aspect ratio and resolution as they see in the theaters, problem is, most of the time the master recording is in LB format.

FORBES: Linux Founder Linus Torvalds Blasts PC Industry, Praises Google's Chromebook Pixel

Rolling Stone, where he'd previously also been publisher for five years, slimmed to a letter-size format.

FORBES: Magazine Article