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简介：At the same time, the piers on the mountains on both sides can also defend against enemies attacking from the land. In other words, whether it is by sea or land, Lushunkou has strong defense capabilities, although it is not as easy as Tongguan and Hangu Pass. It is difficult to defend and difficult to attack, and it is a dangerous place that cannot be opened by one man, but it is enough to make the invading enemy pay a heavy price.