There is some CPU overhead in performing the dictionary translation, however there is also an improvement in disk IO efficiency as more data can be retrieved per IO unit.
在执行字典翻译时有一些CPU开销，但是在磁盘IO效率上也有一个提高，在每个IO单元更多数据可被检索。
The key IO get the high reaction efficiency is strictly controlling the process.
严格地过程控制是保证高反应效率的关键。
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