美国保护该通道的角色始于冷战时期并持续至今。

S. role in protecting this passage began during the Cold War and continues today.

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此外，所有输出通道都提供高电压保护。

In addition, all output channels are provide high-voltage protection.

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此外，所有输出通道都提供高电压保护。

In addition, all output channels are provide high-voltage protection.

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