These are used to indicate a target element in the out going message assembly, where an acquired value should overwrite the existing value (in the case where the element already exists in the tree).

这些表达式用于指示输出消息组件中的目标元素，其中获取的元素应该重写现有值(假如树中已经存在元素)。

youdao

But if it is not, it's going to print out a message here saying, you screwed up, somewhat politely, and it's going to go back around. So it'll just cycle until I get something of the right type.

但是输入不是浮点数的话,我这里就会显示一个消息说，你搞砸了，该稍微有点礼貌吧？,然后我们继续执行循环,一直到得到正确类型的输入。

youdao

If we can convey that message it's probably time for us to take a look at going back out there.

如果我们能传达这个信息，或许才真是我们考虑IPO的时候。

youdao

"So in all of that, let's not have a message going out that patient safety was compromised - it wasn't, " Mr Poots added.

BBC: Ulster Hospital

And right before the ball dropped, he said, I'm going to say a message to fans: You guys out there - those players out there are working their butts off - and you sit there and boo them.

NPR: In the Era of Sports Scandal, Pity the Fan