我的左手和右手
我的左手和右手
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用我的左手手指和右手手指,每个手指指向每个列表的开始处。
I 'm gonna use my left finger and my right finger and each of which is gonna point at the start of each of this list .
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在合并时,我的左手手指,和右手手指来回地在黑板上移动,但对每个数字只会碰到一次。
That 's the finger thing from left finger to right finger going back and forth across the board , never touching a number more than once .