清单4中显示的示例直接来自PEAR手册，我使用它是因为它非常简练。
The example shown in Listing 4 comes directly from the PEAR manual, and I used it because it so concise.
写信时应当简练、清楚，可直接向校园详细入学有些联络，提出申请，讨取资料和表格。
When writing should be concise and clear, but directly to the campus entrance some contact in detail, apply for, please get information and form.
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