Luckily, you can call map.keySet to return a Set, and then you are back in business.
幸运的是，可以调用map .keySet返回一个Set，然后就可以继续处理。
An event indicating that a method call is about to return.
指示方法调用准备返回的事件。
Specifically, a successful call to matchlist will return a list with the following elements.
尤其是，成功调用matchlist将返回一个包含以下元素的列表。
Each call to the function should return one line of input as a string.
该函数的每次调用都应该返回输出的其中一行作为字符串。
We return to a Yu inside, I made a telephone call first.
我们回到寓里，我先打了一个电话。
Some day, and that day may never come, I will call upon you to do me a service in return.
某天，但那天可能永远不会来，我会召唤你给我帮忙作为回报。
Some day, and that day may never come, I would like to call upon you to do me a service in return.
将来，也许那天也不一定到来，我会找你帮忙作为你的回报。
When is a good time to have her return your call?
她什么时候给您回电话比较好？
I'll call in the library to return a book.
我要到图书馆去还一本书。
When is a good time to have him return your call?
他什么时候回电给你比较好?。
The younger brother makes a telephone call to ask me to return when each time!
弟弟每打一电话就问我什么时候回去！
The younger brother makes a telephone call to ask me to return when each time!
弟弟每打一电话就问我什么时候回去！
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