Second, it allows you to change a document, even remove it, without having your code fail when you proceed to the next document.
其次，它允许您更改文档，甚至删除文档，而您处理下一文档时代码不会失败。
Success is the one more minute When you proceed but others recede.
成功就是再别人都放弃时你比他们多坚持的那一分钟。
Success is the one more minute When you proceed but others recede.
成功就是再别人都放弃时你比他们多坚持的那一分钟。
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