Well maybe he saw your hand slip briefly from the ten and two o' clock position.
雷切尔:嗯,也许他看到你的手从十点钟和两点钟的位置短暂地滑了下来。
英语百科
Clock position
A clock position is the relative direction of an object described using the analogy of a 12-hour clock to describe angles and directions. One imagines a clock face lying either upright or flat in front of oneself, and identifies the twelve hour markings with the directions in which they point.