来自《耶鲁大学开放课程：基础物理 第7集 第7集》
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In other words, I grant you I'm willing to put RE here, right?可以说 就算我把 RE 放到这里 -
But there is no way this expression and this can match这两个表达式也不相等 -
because they're not even of the right sign.因为它们甚至在符号上都不统一 -
You don't even have to think more than that.你们都不用多花心思想 -
They cannot be right as they are. Yes?它们怎么都是不对 请讲 -
No, h is the number of meters above the ground.不行 h 是物体距离地面的高度 -
You put the number in.是要代入具体数值的 -
Look, most of your escape routes don't work大多数人的思路都没法解决问题 -
because you're trying to因为你一直在尝试 -
get a positive number to equal a negative number.让负值和正值相等 -
Yes?请讲 -
Thank you.谢谢你