Now the problem was how to get the astronauts back to Earth as quickly and safely as possible.
VOA: special.2009.07.22
Let's test it in all possible combinations of x and y and see if we get the right answer.
来测试并看看,返回的结果正确不正确。
And the interesting thing is, I think you can see-- you can get a feel for both possible answers here.
有趣的是,我想你会发现-,你觉得两种答案都有可能。
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