Single direction traverse 单定向角导线
direction-connecting traverse 方向附合导线
traverse direction
导线的方向
以上为机器翻译结果，长、整句建议使用 人工翻译 。
If wormholes exist, they could be adapted to make time machines that send you into the future if you traverse them in one direction, but into the past if you go in the other direction.
CNN: Time travel: Can it really be done?
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