常見例句Optimization Methods to Improve Clas. 優(yōu)化課堂教法提高教學(xué)傚果。ANSI FLANGED SWING CHECK VALVE CLAS. 美標(biāo)法蘭止廻閥。The little boy is cleaning the cla room. 小男孩正在打掃教室。Make sure if he is in the cla room. 檢查一下他是否在教室。Small-scale cla es with le than 35 students. 小班授課,每班不超過35人。We can borrow a football from Cla 12. 我們可以從十一班借一個足球。 返回 Clas