1.词汇
- Features related to the type system 和类型系统有关的特性
2.例句
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C# 2 doesn’t tackle the issues of return type covariance and parameter contravariance for overriding members or implementing interfaces.
C#2没有解决重写成员或实现接口时返回类型协变和参数逆变的问题。
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But it does improve the situation for creating delegate instances in certain situations.
但它确实改善了在某些情况下创建委托实例的情况。
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C# 3 introduced a wealth of new concepts in the type system, most notably anonymous types, implicitly typed local variables, and extension methods.
C# 3在类型系统中引入了大量的新概念，最显著的是匿名类型、隐式类型的局部变量和扩展方法。
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Anonymous types themselves are mostly present for the sake of LINQ, where it’s useful to be able to effectively create a data transfer type with a bunch of read-only properties without having to actually write the code for them.
匿名类型本身主要是为了LINQ而存在的，在LINQ中，能够有效地使用一堆只读属性创建一个数据传输类型，而不必实际编写这个数据类。
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There’s nothing to stop them from being used outside LINQ, though, which makes life easier for demonstrations.
但是，没有什么可以阻止它们在LINQ之外被使用，它简化了代码。
