有些操作系统使用四个、两个甚至一个字符作为扩展名，而不是三个，但基本的格式仍然是文件名-句点-扩展名。

Some operating systems use four letters or two or even one instead of three, but the basic convention remains filename-period-extension.

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C99 中对 strftime()函数进行了扩展，以提供更多常用的格式化字符。

The strftime() function has been extended in C99 to provide a few more commonly desired formatting characters.

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然后，它用SimpleXML扩展将字符串格式的XML内容转换成一个php对象。

Then it USES the SimpleXML extension to convert the string-formatted XML contents into a PHP object.

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然后，它用SimpleXML扩展将字符串格式的XML内容转换成一个php对象。

Then it USES the SimpleXML extension to convert the string-formatted XML contents into a PHP object.

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