shuāng liú
意思解释：（Double flow）当发送电报信号时，利用反向电流以使信号从传号状态变到空号状态。
万里桥方度，双流径已存。薄寒成翠色，疏雨点黄昏。竹柏密他树，水云平过村。群乌栖欲尽，才到县西门。…
10 thousand lis of bridges just are spent, double shed diameter to already was put. Thin cold Cheng Cui is lubricious, scanty raindrop is crepuscular. He cultivates bamboo Bai Mi, shui Yunping crosses a village. Group Wu Qi is about to use up, just arrive county on the west the door. ...
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