You can think of two hands laced together near the ground, palms up, waiting for a foot. That cup of hands is one extra that was not there a second ago — and one is often the whole difference between not reaching and reaching. The person on top still has to climb; the hands only get them started.
可以想成一雙手在靠近地面的地方十指交握、手心朝上，等著別人把腳踩上來。那雙手就是一秒前還不存在的一階樓梯，而常常就差這一階，搆不到就變成搆得到。上去的人還是得自己爬，那雙手只負責讓他起步。