你必须考虑多个方面：可选类性、类型转换、基本类型（primitive types）、构造类型（constructed types）（其构造器返回结果也是可选类型）、字符串类型的键（key）以及其他一大堆问题……
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Extension methods, which make it possible to extend existing types and constructed types with additional methods.
的方法扩展已存在的类型和构造类型成为可能。
In effect, extension methods make it possible to extend existing types and constructed types with additional methods.
效果上，扩展方法使得用附加的方法扩展已存在类型和构造类型成为可能。
We are excavating near the lecture hall to see what types of artifacts we find—things people used in the past that got buried when the campus was constructed.
我们在演讲大厅附近挖掘，看看能发现什么类型的手工艺品——就是人们之前用过的，在建造校园时被埋掉的东西。
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