两者结合使用可方便地定义新语句，无需扩展语法，也无需使用类似宏的元编程工具。

A joint use of both features facilitates the definition of new statements without extending the syntax and without using macro-like meta-programming facilities.

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解释完宏之后，连接将处于活动状态并准备执行sql语句(参见清单2)。

After the macro is interpreted, the connection is active and ready to execute SQL statements (see Listing 2).

youdao

为此，我们将使用with - syntax，这本质上是用于宏的“let”语句。

To make this happen, we will use with-syntax which is essentially a "let" statement for macros.

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