意思上没什么区别.非要看细微差异的话,如果问题中强调了时间,比如"what is he doing lately?- 他最近干吗呢?",那你回答"He is teaching in a middle school.他在一所中学教课".如果问题不强调时间,仅仅是泛泛地问"Wh...