加拿大进出口外贸 每日一笑。。 在加拿大 A fourth-grade teacher was giving her pupils a lesson on logic. 小学四年级的教师正在给学生们上一堂逻辑课。 Here is the situation, she said. a man is standing up in a boat in the middle of a river, fishing. He loses his b...华人论坛 日期：2022-06-19