在清单6中，循环被移出同步语句，所以它可能由多个线程并行执行。

In Listing 6, the loop is out of a synchronized block, so it can be executed by several threads in parallel.

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清单4的% MACRO_FUNCTION显示了使用while循环执行了40次的六条insert语句。

The % MACRO_FUNCTION of Listing 4 shows six insert statements executed 40 times using a while loop.

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for 循环，它对一个语句块执行一定次数。

The for loop, which executes a block of statements a certain number of times

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