1、on的读音：英 [?n] 美 [ɑ?n]，在…上。
2、I got to know David on the second day of middle school. 我在上中学的第二天就认识了大卫。
3、Several workers interviewed during a factory visit on Friday said they were also doing overtime each Saturday. 在上周五参观该工厂期间，一些接受我们采访的工人表示，他们每周六也要加班。
