Floor mark to describe small route and narrow channel.

地面记号用来描绘小路及狭窄的通道。

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All along the river lights mark the channel so that boats can travel at night.

沿江都有航标灯标明航道，船只可以夜航。

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All along the river lights mark the channel so that boats can travel at night.

沿江都有航标灯标明航道，船只可以夜航。

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