使用美元的习惯是因为交易的一方或多方使用的货币不同。
The convention of quoting in dollars is often employed when the currency of one or more trading partners is not used.
引用是应用程序的特定指针，该指针指向通常存在于更大的上下文(如服务器或集群)中并且供多方使用的对象。
A reference is an application specific pointer to an object that usually lives in a larger context, such as a server or cluster, and is used by multiple parties.
我们可以用很多方式重复使用水。
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