problem houston we have a problem assigument problem toán kinh tếbái toán phân phối ballot problem bài toán bỏ phiếu bargaining problem bài toán hợp đồng barrier problem bài toán màn chắn blending problem bài toán pha trộn bottle neck problem bài toán cổ chai boundary value problem bài toán biên trị, bài toán bờ brachistochrone problem
there has always been a problem There has always been a problem with teachers being from a different generation to their pupils, particularly older educators. But the dominance of digital technology has spread that generation gap even wider, as young people become conversant with mobile digital devices, games and social media that didn’t exist when their teachers were
a problem feeling or belief = A deep-seated problem, feeling, or belief is difficult to change because its causes have been there for a long time. Tạm dịch: Một vấn đề, cảm giác, hoặc niềm tin đã ăn sâu thì rất khó thay đổi bởi vì nguyên nhân của nó đã tồn tại trong một thời gian dài
