That cost is slightly lower throughput and a small reduction in kernel performance because of the added overhead of the CONFIG_PREEMPT option.

代价就是略微减低了吞吐量以及内核性能，原因是CONFIG_PREEMPT选项增加了开销。

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Based on the Numbers, the NoTracking option provides a big reduction in the amount of time, where most of this gain comes when we stop tracking changes and managing relationships.

基于前面的一组数字，NoTracking选项能够大幅度地降低执行的时间，而其中性能的提升主要源自于我们停止了对变更的跟踪以及对关系的管理。

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The critical point of chemical reduction was the option of reducing agent.

化学还原法的关键在于还原剂的选择。

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