当algernon向左转时,它先向前走一点儿,让它的背部超过左边通道的墙。
When Algernon turns left, he first goes forward a bit so that his back is clear of the wall ending to his left.
如果看到左边有通道,就向左转。
当左边出现通道时,这个传感器会发出警报。
This sensor will alert you when the maze has passages going off to the left.
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