赌局主持人给每个玩牌者发了一张牌，牌面向下。

The croupier dealt each player a card, face down.

《柯林斯英汉双解大词典》

地面向下延伸到海滩。

The ground shelves down to the beach.

youdao

我在上面向下移动，遇到气泡线。

So I'm up here going down, I'm going to hit the bubble line.

youdao

As we talk about this, as people talk about this, in the context of our object-oriented programming, they typically will talk about it in terms of message pass, a message passing metaphor.

当我们讨论这个的时候，当人们讨论这个的时候,在面向对象编程的背景下它们往往会,被称为消息传递，也就是传递隐喻的消息。

麻省理工公开课 - 计算机科学及编程导论课程节选