If you run this code with a larger number for the Fibonacci sequence index (say, 12), you'll end up watching output scroll by for a long time.

如果对大的斐波纳契数列(比如说12)使用这段代码，将会看到长时间的滚动输出。

youdao

To this end, we attach a "tee" (T-shape pipe) that permits two things at the same time: placing the output into a file AND displaying the output into the screen. The plumbing analogy would be.

为达到此目的，我们连接允许两件事同时进行的“ tee ” (t -形管道)：将输出结果放在文件中同时将输出结果显示在屏幕上。

youdao

Most of the programs we have seen so far are transient in the sense that they run for a short time and produce some output, but when they end, their data disappears.

目前为止我们见过的程序大多是很短暂的，它们往往只是运行那么一会，然后产生一些输出，等运行结束了，它们的数据就也都没了。

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