It allows you to open the /etc/passwd file and read each line one at a time, cutting out just the first field in the file and then printing that line.
它允许您打开 /etc/passwd 文件，并且每次读取其中的一行内容，仅截取文件中的第一个字段，然后打印这行内容。
If instead the preceding code did not contain line 2 and if you used a second button with an Open page simple action to go to page2, the computed field would come back empty.
如果上述代码中不包含第二行内容，并且使用带有简单操作Open page的第二个按钮以转到page2，那么computed字段将返回空值。
Three open star clusters, Charles Messier's M36, M37, and M38 line up in the dense star field above and left of Elnath, familiar to many binocular-equiped skygazers.
三个疏散星团，梅西耶天体M36、M37和M38在恒星密集的图片上部、五车五的左边排成线，是双筒望远镜熟悉的观测目标。
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