消息也可以具有一个向前的和保留的路由通道。
The message may also have a forward and reserve routing paths.
他弓着腰向前，穿过拱形的通道。
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.
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