以下为句子列表：
英文: An extra twisted pair must be specified to have enough conductors to run a signal ground.
中文: 必须预定有额外的双绞对，以有足够的导线作为信号地的通路。
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英文: LWY: For telecommunication lines, when its outside part uses optical fiber cable and at the entrance of building it is then changed to metallic line, such as twisted pair or coaxial cable.
中文: 关于电信线缆，当它的外部使用光纤电缆，而在建筑的入口处改成了金属电缆，如双绞线或同轴电缆。
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英文: That is, it varies up and down significantly, while generally increasing in magnitude. This is because twisted pair coupling becomes less effective for higher frequencies.
中文: 当总体的磁场强度变化时，它明显的上下变化，这是因为双绞线对较高的频率不敏感。
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