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.

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。

哈佛公开课 - 计算机科学课程节选

There's a lot more than sex implied in this redemptive touching.

在这救赎的触碰里不仅只有性。

耶鲁公开课 - 弥尔顿课程节选