影响大脑温度的因素这几种：大脑需要承受的工作量，血液的温度和血液流向大脑的速度。
Brain temperature is influenced by the amount of processing the brain is having to do, the temperature of the blood and the rate at which it flows to the brain.
当你使用嘴角的“微笑肌肤肉”时，你改变了流进脸部血液的方向，用这种方式能降低血液的温度。
And when you use the "smile muscles" at the corners of your mouth, you change the direction of the blood flow inside your face in such a way that it causes the temperature of the blood to drop.
在上述两种情况下，我们的血液温度可以达到很高或很低。
In neither situation above, our blood can reach the point so high or so low in temperature.
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