请保留这份讲义以备将来参考。

Please keep this handout for future ___reference.

您能否也为我们提供所有300家酒店的列表供我们参考。

Can you also provide us with the list of all 300 hotels for our ___reference.

为了快速参考，我总是在桌子上放一本字典。

For quick ___reference, I always keep a dictionary on my desk.