As a teacher，she or he should have a good knowledge of the subject that will be taught to the As an old saying goes: a teacher should have a barrel of water if he wants to give his students a drop of And some people also say that the teacher is just like a library where any student will choose a book at any time and the teachers should always be ready for it But in the meantime I think the teachers' working attitude and the concern to the students should also be equally important Because the teachers will be active in their teaching only if he likes his work and the students What's more ，if the teachers can show the concern to the students ，they will be encouraged to study hard， which will have a good effect on the students' So not only should the teachers have a good knowledge but also they should have an active working attitude and the concern to the
