母亲却表现出不悦：“你怎么总把人心想得那么坏？我学点新东西，发挥点余热，有什么不好？难道我什么都不做，你就高兴了？”
"We monitor the size, shape and growth of the [fire]," he adds, explaining that this helps to avoid false alarms triggered by pictures of fires, or fires on a TV screen, that happen to be in shot.
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语重心长的叮嘱，既指明认识论，也给出方法论。，推荐阅读夫子获取更多信息
However, Tolley points out that humans don't move the way fans spin, at all. "We want to be able to lift things, and push things, and do things that require a lot of force and torque."，推荐阅读91视频获取更多信息