单词	back up copy
释义	back up copy 副本
随便看	block record block recursive system block-recursive system block redundancy check block reference block reference density block reference set block reference string block register block relaxation block relaxation method block relay block-release block release block release course block-releases block repeater block replacement block replacement policy block representating block representation block research block-resection block resection of jaw block reservation 百代过客百伶百俐百依百从百依百随百依百顺百兽率舞百凡待举百动不如一静百卉千葩百发百中鸢飞鱼跃鸣鸣冤鸣叫鸣哨鸣啭鸣天鼓鸣奏鸣指鸣放