Only one call is made, but the output is printed twice.
虽然只发出了一个调用，但是打印了两次输出。
Our printed layout consists of the graphics and text from the tutorial, combined with page Numbers, headers, and footers to create high-quality printed output.
打印出来的布局由教程中的图形和文本组成，再加上页号、页眉、页脚一起创建高质量的打印输出。
A message is printed on standard output to let the user know a signal was sent.
在标准输出中会打印一条消息以让用户知道发送了一个信号。
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