教学平均速度,往往“言之者虽诚,闻之者未喻”。若以学生熟悉的平均年龄来类比,虽欠惬当,但有助理解。一、一般说来,一班人的年龄不尽相同,其平均年龄只能粗略地、笼统地反映这班人的年龄状况。同样,一般物体运动,每时每刻的快慢不尽一样,平均速度仅能粗略地、笼统地描述其快慢程度。 The average speed of teaching is often referred to as “the person who speaks honestly, and who he hears is not yet understood.” An analogy to the average age at which students are acquainted is not a good idea, but it helps to understand. 1. In general, the age of a group of people is not the same, and their average age can only roughly reflect the age of this group of people. In the same way, in general, objects move at different speeds and at different speeds. The average speed can only roughly describe the level of speed.