... 第一次侍线机 primary line switch 一次干线 primary main 一次网络 primary network ...
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一次配电干线 primary distribution main
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世界上一次性建设里程最长、运营速度最快的铁路——武广高铁客运新干线正式开通运营。
Wuhan-Guangzhou high-speed railway, which has the world's longest mileage of one-time construction and the highest speed of railway operation, has officially opened.
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