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。
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。
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)。
And, to boot, the fact that, because the if expression is an expression returning a value, the return from sort is implicitly the (single) expression in the definition of sort .
事实上，在引导装入程序之后，因为if表达式是返回某个值的表达式，所以从sort返回的是sort的定义中的(单个)表达式。
If she were not so sallow and had a nicer expression, her features are rather good.
如果她脸色不这么灰黄，表情好一点，那她的五官会很好看。
The place was, if you'll pardon the expression , a dump.
那个地方，请恕我直言，简直是个垃圾场。
He's a pain in the butt, if you'll pardon the expression.
请原谅我这么说，他是一个讨厌透顶的家伙。
What do you think should happen if I evaluate that expression?
你认为我对表达式求值的话,会发生什么？
If an expression contains values outside the remote limits, those expressions cannot be pushed down.
如果一个表达式包含超出远程限制的值，那么就不能下推那些表达式。
If you enter an invalid expression, the text turns red.
如果您输入一个无效的表达式，其文本将变为红色。
You can compare data to a regular expression; if they match, you know your data is valid.
您可以将数据与正则表达式进行比较，如果它们匹配，则知道数据是有效的。
If the expression doesn't contain any more parentheses, the process of evaluation is finished.
如果表达式再不包含任何其它的括号，求值(过程)完成。
It is not that we would not know what the loss meant if there was no expression; we would know, but we wouldn't feel it fully if medications soothed our despair.
如果不表达的话，那我们就不会知道失去意味着什么；我们可能知道，但如果药物治疗安抚了我们的绝望，那我们可能不能完全感受到。
If neither is possible, any expression using a large string needs to be evaluated locally.
如果两种形式都不行，那么任何使用大型字符串的表达式都需要在本地计算。
If a method body has more than one expression, you must surround it with curly braces {...}. You can omit the braces if the method body has just one expression.
如果一个方法的主体包含多于一个的表达式，你必须用大括号来把它们包起来。你可以在方法主体只有一个表达式的时候省略大括号。
Step 3: If the expression doesn't contain any more parentheses, the process of evaluation is finished.
步骤3：如果表达式中不包含其它括号，求值的过程就完成。
If the expression contains parentheses but no operators, there is a function here.
如果表达式包含括号，但不包含操作符，则存在一个函数。
The WHERE clause contains two expressions that are joined by the or operator, which means that if either expression evaluates as TRUE for a specific row, that row will be deleted.
where子句包含由OR操作符联结的两个表达式，这意味着对于特定行，如果任一表达式值为TRUE，则将删除该行。
If a logical expression is hard to understand, try transforming it.
如果一个表达式的逻辑不容易理解，则需要试着改变其形式。
If the postfix expression was correctly formed, the stack should be empty.
若后缀表达式格式正确，那么堆栈应该为空。
You can create a more attractive expression if you have your model lower the chin because it will increase the size of the eyes.
通过收下巴，你的模特可以拥有更迷人的表情，因为这样眼睛就显得大了。
If the expression contains parentheses but no operators, there is a function here that needs to be evaluated.
如果表达式包含括号，但不包含操作符，则存在需要求值的函数。
If the expression results in more than one node, then only the first node is used.
如果表达式产生多个节点，则仅使用第一个节点。
If the xpath expression specified is invalid, an xpath-valid error is reported.
如果指定的xpath表达式是无效的，将报告xpath - valid错误。
If the XPath expression contains a % sign itself, it must be escaped as specified by XML (using %).
如果XPath表达式本身包含%，则必须按xml的指定方式将其转义(使用%)。
If your expression evaluates as false and thereby triggers an assertion failure, a predefined routine called assertion_failed declared in the header file assert.hpp is executed.
如果您的表达式计算得到false，因此触发了一个断言失败，那么将执行在头文件assert . hpp中声明的一个名为assertion_failed的预定义例程。
If an XPath expression contains a percent sign itself, it must be escaped, as specified by XML (using %).
如果XPath表达式本身包含一个百分号，则必须按xml的指定方式将其转义(使用%)。
If the expression you're passing in to the parser code can't be legally constructed according to the grammar, either a ParseException or a LexicalError is thrown.
如果正在传递给解析器代码的表达式不能根据语法合法地构造，则将抛出ParseException或LexicalError。
Otherwise, if the expression is not a constant, another macro function is called to round up the value to a power of two.
如果表达式不是常量，就调用另一个宏函数把值向上取整到2的幂。
Otherwise, if the expression is not a constant, another macro function is called to round up the value to a power of two.
如果表达式不是常量，就调用另一个宏函数把值向上取整到2的幂。
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