写有关孤独症的文章有一个问题，那就是读者总是想知道一个结局。
One of the problems with writing about autism is that readers tend to want an ending.
所有的这些都跟一个变量有关，也就可以来做单变量积分了，有问题么？
You express everything in terms of a single variable and then you do a usual single integral. Any questions about that?
但是有一个问题：有关种族的科学研究很难得，很难了解其原因。
But there's a problem: scientific research on race is hard to come by, and it's not difficult to see why.
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