第二行打印出了book的值 --ProgrammingScala。

The second line prints the value of book, which is “Programming Scala”.

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在接下来的一行，我们创建一个表达式并把它打印出来。

On the next line, we are creating an expression and printing it out.

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要确认结果，请打印出job表中的所有行，如下。

To verify the result, print out all rows in the JOB table, like this.

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要确认结果，请打印出job表中的所有行，如下。

To verify the result, print out all rows in the JOB table, like this.

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