| 第 45 课: 各种运算：加，减，乘，除-4 Eight minus two equals six. 八减二等于六 Eight minus four equals four. 八减四等于四 Seven minus three equals four. 七减三等于四 Seven minus five equals two. 七减五等于二 Twelve minus five equals seven. 十二减五等于七 Twelve minus six equals six. 十二减六等于六 Twelve minus seven equals five. 十二减七等于五 Twelve minus eight equals four. 十二减八等于四 |
