Items属性未被缓存，因此总是从数据库中反复不断地请求所有数据项。
The Items property is not cached and therefore always requests all items from the database over and over again. Here is how the first loop iterations look
如果只是因为数据库允许您请求，就不断地为一个已经预订的房间保存新的预订请求，那没有比这更令人沮丧的了！
Nothing would be more frustrating than to have to repeatedly save new reservation requests for an already-reserved room just because the database lets you request it anyway!
持续不断地将你的请求交给你的潜意识来解决，总会守得云开见月明。
Keep on turning your request over to your subconscious until the day breaks and the shadows flee away.
使用软装入，如果出现了错误，那么将立即对请求的程序进行报告；而对于硬装入，NFS将不断地进行重试。
With a soft mount, if there is an error, it is reported immediately to the requested program, while with a hard mount, NFS keeps retrying.
使用软装入，如果出现了错误，那么将立即对请求的程序进行报告；而对于硬装入，NFS将不断地进行重试。
With a soft mount, if there is an error, it is reported immediately to the requested program, while with a hard mount, NFS keeps retrying.
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