数据字段可以多次更改，在写入磁盘之前它位于缓存中。
A data field can be changed multiple times while in the cache before it is written to disk.
最后，MobilePortal利用WebSphere Portal来识别移动设备、生成特定设备的内容，并且创建一个一次写入、多次复用的程序模型。
Finally, mobile Portal takes advantage of WebSphere Portal to recognize mobile devices, generates device-specific content, and achieves a write-once, render-many programming model.
这就可能需要每次应用程序调用进行多次日志写入操作。
MapReduce适合于一次写入多次读取的应用场景，而一个关系型数据库擅长于频繁地更新应用。
MapReduce suits applications where the data is written once and read many times, whereas a relational database is good for datasets that are continually updated.
迭代器指向的元素可以写入和读出任意多次。
The element that the iterator points to can be both written to and read from any number of times.
迭代器指向的元素可以写入和读出任意多次。
The element that the iterator points to can be both written to and read from any number of times.
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