So, that point starts falling back behind the point of contact because the wheel is rotating at the same time as it's moving forward.

这个点开始落到切点的后面,因为车轮滚动的同时也向前运动。

youdao

At the sink, hot is to the right and cold left, the opposite of standard, and in the shower the rotating handle starts at scalding and gets colder from there, again the opposite.

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