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最后，将所有的文档对象写入到输出流。
Finally, each document object is written to an output stream.
youdao
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该函数将对象的信息转储到标准输出流。
This function will dump the object's information to the standard output stream.
youdao
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该函数将对象的信息转储到标准输出流。
This function will dump the object's information to the standard output stream.
youdao