它们就像飞机场的风向袋，能在水流中保持方向，这样可以找到最好的发电位置。
They are able to align themselves in the current like windsocks at an aerodrome, so that they find the best position for power generation.
而保护意味着使用保持在与高阻抗电路相同电位的附加的低阻抗导体来阻止可能的干扰电压或电流。
Guarding implies the use of an added low impedance conductor, maintained at the same potential as the high impedance circuit, which will intercept any interfering voltage or current.
在这种情况下， 流过导线的电流与保持的电位差成正比。 （ 分词和分词短语作定语）
In this case, the current flowing through a wire is directly proportional to the potential difference maintained.
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