Specifically, methods that accept only a CancellationToken can observe a cancellation request but cannot initiate one.
特别地，方法只能接受CancellationToken，这样它就只能观测撤销请求而不能初始化一个撤销。
Rather, it is something to be aware of so that one doesn’t do unnecessary things such as pass in a CancellationToken that isn’t ever used.
它只是需要注意的问题，这样我们就不会做不需要的事情，像传入从来不会用到的CancellationToken等。
Rather, it is something to be aware of so that one doesn’t do unnecessary things such as pass in a CancellationToken that isn’t ever used.
它只是需要注意的问题，这样我们就不会做不需要的事情，像传入从来不会用到的CancellationToken等。
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