Picture a stream with flat stones laid across it in a line. You cannot jump the whole width, so you put one foot on the first stone. From there you can reach the second. Nobody stays on a stone; you stand on it exactly long enough to get to the next one, and then to the far bank. That short stay is the whole idea of the word.
可以想成一條溪，水面上排著一列平石頭。你跳不過整條溪，所以先踩上第一顆。踩穩了，才搆得到第二顆。沒有人會停在石頭上。你站的時間，剛好夠讓你走到下一顆，最後上岸。那種「只是暫時站一下」的感覺，就是這個字的重點。