This kind of guard shield holds the leading position in the world.

这类护罩在世界占有领先地位。

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Now this shield is driven by a unity-gain, low impedance amplifier (Guard).

这个屏蔽由一个单位增益的低阻抗放大器(保护)驱动。

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To protect, guard, or shield.

保护，保卫，阻挡。

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To protect, guard, or shield.

保护，保卫，阻挡。

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