A covariant delegate can be assigned another delegate of the same type, but with a more derived generic type parameter.

可以向协变委托分配同一类型的其他委托，但需使用派生程度较大的泛型类型参数。

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Handlers for those events might, in turn, trigger another service or process — or trigger the creation of one or more derived events.

这些事件的处理程序可能会反过来触发其他服务或流程——或触发一个或多个派生事件的创建。

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The purpose of a calculation component is to take one or more values as an input and to produce one or more derived values as output.

计算组件（calculation component）的功能是输入一个或多个值后能够生成一个或多个派生值作为输出。

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The company derived more than three-quarters of its 2008 revenues from North America.

FORBES: Magazine Article

There were more than 853, 000 slot machines in use at U.S. casinos last year, and casinos in Iowa and South Dakota derived more than 90 percent of their gambling revenue from slots last year.

WSJ: US casino revenue up nearly 5 percent in 2012

No arena in our top 10 list derived more than 4% of its revenue over the past year from corporate naming rights (and three of them--Yankee Stadium, Cowboys Stadium and Madison Square Garden--get none at all).

FORBES: Sports Business