parameter type的用法和样例：
例句
- The return type and parameter types of a delegate type must be at least as accessible as the delegate type itself.
委托类型的返回类型和参数类型必须至少与委托类型本身具有同样的可访问性。 - When a generic method is called without specifying type arguments, a type inference process attempts to infer type arguments for the call.
当不使用特定类型的参数调用一个泛型函数时，类型推断会尝试为此次调用推断参数类型。
