read-in data
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一旦写入数据块，元数据将随后写入日志。
Once they are written, the metadata changes are then written to the journal.
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这篇文章的第一个代码清单向文件写入数据。
The first code listing in this article wrote data to a file.
迄今为止的示例都侧重于读取数据，而不是写入数据。
So far, the examples have focused on reading data, not writing data.
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