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来源:雅诚德英语网
In forests, visual signals can be seen only at short distances, where they are not obstructed by trees.
在森林中,视觉信号只能在没有树木遮挡的地方在短距离内被看到。
In forests, visual signals can be seen only at short distances, where they are not obstructed by trees.
在森林中,视觉信号只能在没有树木遮挡的地方在短距离内被看到。