“那天我正到城里去乘车上班，”Andy Inglis说，“一个人边逛边想着我自己的事，一辆前排坐着几个小伙子的白色小货车驶进拐角，其中的一个探出窗外大喊，‘姜仔！”’
"I was walking into town to get a bus to work," Andy Inglis says, "strolling along minding my own business when a white van came around the corner with a few blokes in the front seat."
这里，就在曲线的拐角，速度一开始是正的，不过在另一边就成了负的，就加速度而言这又意味着什么呢？
Here, when it makes this rounding curve the velocity is positive here, but on this side it's negative so what does that mean for the acceleration?
多边形工具则提示输入边的数量后，首先确定一个拐角位置和邻近一点的拐角位置。半圆工具则提示确定起点和终点的位置。
The Polygon tool prompts for number of sides, first corner position, and adjacent corner position. The Semicircle tool prompts for start and end points.
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