Results show that it is difficult to make cathodic protection on bare steel because of large current density, and that cathodic protection is suitable for coated steel.

试验结果表明，对裸钢采用阴极保护时，所需电流密度较大，实施难度较大；而对有涂层的钢则更宜采用阴极保护措施。

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Our ability to store electricity in batteries is improving, but current low energy density makes batteries an inefficient choice for large-scale storage.

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