接着，他们互相打了招呼，握了手，就一块往前走。

Then there was a greeting and a shaking of hands, and the three went on together.

youdao

但他们看了我游泳之后，就开始跟我打招呼和交谈。

But after they saw me swimming, they started to say "hi" and talk to me.

youdao

凯蒂想多看一眼，但是他父亲喊她过来，我在前面忙着招呼仆人，他们就一块走到花园里去了。

Cathy would fain have taken one glance, but her father told her to come on, and they walked together up the park, while I hastened before to prepare the servants.

youdao

So if you haven't already, just glance at the person next to you, or say hello if you don't know them.

如果你还没有做好，那就看看你旁边的人,如果你不认识他们就跟他们打个招呼。

哈佛公开课 - 计算机科学课程节选