括号中的表达式可以扩展到多个行。

Expressions enclosed in parentheses can extend over multiple lines.

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现在，我们需要知道的是，在括号中的表达式组成了一个字面函数，并且传递给了receive。

For now, what you need to know is that the expressions inside the braces constitute a single function literal that is passed to receive.

youdao

Angular对所有双花括号中的表达式求值，把求值的结果转换成字符串，并把它们跟相邻的字符串字面量连接起来。

Angular evaluates all expressions in double curly braces, converts the expression results to strings, and links them with neighboring literal strings.

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