This is a letter of introduction.

这是一封介绍信。

youdao

Write a letter of introduction for me.

请你给我打介绍信。

youdao

A: I have a letter of introduction here.

A：我这儿有一封介绍信。

youdao

She stole up the long drive to the Lahore house of the retired civil servant and landlord K. K. Harouni, bearing in her lacquered fingers a letter of introduction from, of all people, his estranged wife.

NEWYORKER: In Other Rooms, Other Wonders

Wolcott came to New York, in the fall of 1972, because Norman Mailer liked an article he had published in his college paper the article, not coincidentally, was about Norman Mailer and had written a letter of introduction to Daniel Wolf, who then edited the Village Voice.

NEWYORKER: What She Said

On the day Mar'ie confirmed the scheme, the Fund sent a strongly worded letter warning against a premature introduction of a peg.

CNN: Suharto's Gamble