For example, a compiler may choose to optimize a loop index variable by storing it in a register, or the cache may delay flushing a new value of a variable to main memory until a more opportune time.
例如，编译器为了优化一个循环索引变量，可能会选择把它存储到一个寄存器中，或者缓存会延迟到一个更适合的时间，才把一个新的变量值存入主存。
New enhancements in DB2 lift this restriction, allowing for greater flexibility and avoiding application delay or downtime when an XML index needs to be created or reorganized.
DB 2中新的改进消除了这一限制，这可以显著提高灵活性，避免在需要创建和重组xml索引时出现应用程序延迟或停止运行。
Percent Time-Spent-Following (Percent Time Delay) is an important index to estimate Level-of-Service of tow-lane highways.
跟车时间百分比（延误率）是衡量双车道公路服务水平的一个重要指标。
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