单一实例指的是旨在让应用程序中一次只存在一个实例的类。
Singletons are classes that are designed to have only one instance existing at a time in an application.
不过这样做有一个问题就是一整天只吃水果和沙拉有些口味太单一了。
But consistently eating raw is a challenge if you don’t want to eat very boring meals all day long like fruit and salads.
这可能只包括一个像运输或仓储或单一服务可以包括一个完整的供应链整合。
This may include only a single service like transportation or warehousing or could include a complete integration of the supply chain.
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