The type inference picks a type that works for all outcomes of the if expression.

类型推断选择了一个满足if表达式所有结果的类型。

youdao

This case only succeeds if the accompanying guard expression (the if expression that follows it) succeeds, which will only happen for the first Person but not the second.

这个case只有在同时提供的起保护作用的表达式(跟在它后边的if表达式)成功时才会成功，但只有第一个Person会这样，第二个就不会了。

youdao

When this macro executes, it will match the my-if expression up to the template like this (in other words, matching a macro invocation to a macro definition pattern).

在这个宏执行时，它按照以下形式将my - if表达式与模板进行匹配(换句话说，将宏调用与宏定义模式进行匹配)。

youdao

If you ever tried to walk on a fallen tree log, you understand what the expression means.

VOA: special.2009.06.07

The driver's expression and his hand stayed exactly the way they were, as if he didn't hear very well.

就像是没怎么听见似的,那个司机的表情和手几乎一动不动，“

耶鲁公开课 - 1945年后的美国小说课程节选

And now, if I'm touching mouse pointer, we saw that Boolean expression before, play sound meow, wait a couple of seconds, and then just keep checking.

现在，如果我们碰下鼠标指针，起初我们看到一个布尔表达式，播放猫叫的声音，等几秒钟，然后如刚才那样做检测。

哈佛公开课 - 计算机科学课程节选

It is unlikely that the UKNC will be able to support an application for the 2015 cycle if an Expression of Interest has not been received by this date.

UNESCO: Apply to join the UNESCO Creative Cities Network

If you feel as if your expression of emotion is causing your workmates to disrespect you, explain your supposed weakness as I often did when my professional mien tripped over anger at yet another workplace injustice.

FORBES: Hillary Clinton Emotes On Capitol Hill

She wondered if the lion's expression might be different if her husband stood beside her at the window.

NPR: Excerpt: 'Lost in Uttar Pradesh'