克雷文医生用手托着下巴，仔细思考着他。
狗似乎天生就懂得人们如何用手指向事物来引起他人注意，而且狗能遵从人们的手势，就好象它们和我们用同样的方式思考。
Dogs seem to have a ready understanding of how human beings direct attention by pointing, and can follow our gestures almost as if they thought the same way we do.
如果他们使用手语，又用英语阅读，他们是不是就用英语来思考呢？
Would they think in English if they use sign language and read English?
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