优化大型索引可能会非常耗时，而且应该在索引更新不是很频繁的情况下才进行。
Optimizing a large index can be very time-consuming and should be done, if at all, when index updates are infrequent.
这五个注释你现有情况的活动或许显得有些不足，而大多数用的情况下是很耗时的，并且包括很多手动的工作。
These five activities to annotate your current situation may seem short, but most are very time intense and include a lot of manual work.
比如有人认为它太慢了，血液反馈通常耗时2到5妙，但是思维跃动一下只消毫秒之间。
One is that it's slow. The blood flow response can take two to five seconds, but a thought can flash in milliseconds.
应用推荐