请注意，我刚做了一个90度直角转弯，而且没有从空中掉高度！
Note that I just made a 90 degree turn and didn't fall out of the sky!
为了简化算法实现，假设墙的转弯都是直角的。
To simplify the algorithm implementation, I'll assume that walls are laid out at right angles.
为了简化算法实现，假设墙的转弯都是直角的。
To simplify the algorithm implementation, I'll assume that walls are laid out at right angles.
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