连接曲线或多段线的第一点与最后一点。
Connect the first point of a curve or polyline with the last one.
例如,polyline这个多段线函数,需要四个实际参数:t必须是一个Turtle小乌龟;
For example, polyline requires four arguments: t has to be a Turtle;
例如,polyline这个多段线函数,需要四个实际参数:t必须是一个Turtle小乌龟;
For example, polyline requires four arguments: t has to be a Turtle;
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