你若不能来，在我的信件格里留张便条。

If you can't come, leave a note in my pigeonhole.

《牛津词典》

在前台给他留张便条，他会从便条上知道怎么找到你。

Leave him a note at the reception desk, from which he will learn how to find you.

youdao

如果你准备离开家，给家人和朋友留张纸条，告知你将要去哪里。

If you leave home, leave a message telling friends and family your location.

youdao

And I get down to a certain card and I am stumped, so I will leave a space waiting for that card to appear on cue.

我遇到某张牌,会被困住，我会留些地方给,恰好要出现的牌。

麻省理工公开课 - 固态化学导论课程节选