youdao

One person communicates with another, only it happens faster than a postman takes to drop a letter through a door.

这无非是一个人与另一个人传递信息，只不过比邮差把信扔到门里快一些。

youdao

Sit with an open door and encourage members to drop by anytime and talk to you.

开门办公，欢迎团队成员在任何时候都可以找你谈谈。

youdao

A book drop is the small metal door in the wall of the building where people can return books when the library is closed.

VOA: special.2009.02.23

That space is home to the button controlling the drop-down door (much more on that later, of course).

ENGADGET: Acer Aspire S5 review: is this innovative Ultrabook worth $1,400?

Obviously, the conceit of the S5 is that most of its ports are tucked behind MagicFlip, that motorized drop-down door on the laptop's rear edge.

ENGADGET: Acer Aspire S5 review: is this innovative Ultrabook worth $1,400?

But these are all tucked in the back of the machine, and are covered by a drop-down latch door.

ENGADGET: HP TouchSmart 610 review