这意味着只在对数据库进行求值之后才会对它们执行查询，这会比立即执行查询的速度更快。
This means that they do not execute against the database until they are evaluated, and thus run much faster than immediate queries.
因此可以减少对数据库日志文件的使用和提高数据移动的速度。
Therefore, decreasing the database log file consumption and improving the speed of moving data.
这成功提高了文件的读写速度，特别是在有经常性改动的驱动器下，比如你用来暂存或交换文件的驱动器，或者，对数据文件有频繁修改的驱动器。
This enables faster file reads and writes, especially on drives with frequent changes, such as the drive you use for temporary or swap files or drives with frequent modifications to data files.
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