杨石先先生著名科学家、教育家杨石先教授治学十分严谨,在南开大学理工学院讲授普通化学课时,身上至少带三块表:一块是背心左侧小口袋里揣着的金壳怀表,表链系在背心纽扣上;一块是戴的手表;还有一块是无链的怀表。他上课时,把无链怀表放在桌上看时间,有时也看看有链怀表,有时又伸长手臂看手表,为的是掌握讲课节奏,把所讲的内容在授课时间内恰到好处地讲完,不拖堂也不浪费时间。他的课总显得紧凑而又干净、干脆,令人愉悦。 Yang Shixian well-known scientist and educator Professor Yang Shixian scholarship is very rigorous, taught at the Nankai Polytechnic Normal chemistry class, who at least with three watches: one is a small pocket in the vest left Chuaizhuo gold shell pocket watch, the bracelet in the vest button On; a watch is worn; there is a chainless pocket watch. When he was in class, he put the chainless pocket watch on the table to watch the time, and sometimes he also looked at the chain pocket watch, and sometimes extended his arm to watch, in order to master the rhythm of the lecture and to just say what he said during the lecture time End, do not drag the temple nor wasting time. His class always looks compact and clean, crisp and pleasing.