But sinking wires, which means clearing a corridor 17m to 40m wide and cannot be done in all terrains, carries an environmental toll too.

但是埋地电缆也有相应的环境代价，它意味着清理出一条17 m到40 m宽的通道，而这并非在所有地形条件下都能做到。

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These are then sewn into a very small (1.22mm wide) lead made of a polymer yarn and wires, which are then inserted into the spine.

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