是work hard at English 还是on English?为什么

work hard at hard 是work hard at sth.还是work hard on sth. 英译汉:work hard at work hard at中文 work hard in还是work hard at? work hard at English是什么意思 I work hard at school. hard at work school I(? 是work hard at English 还是on English?为什么 work hard on the subject,work hard at English,in your lesson,又是at,又是 on At work,I must work hard work hard at和work hard on 的区别 I work hard at schoo 和 At school Iwork hard work hard on , work hard at, work hard for 和work hard to的用法之差异 work hard at的汉语是什么 school hard at work连词成句 Please ____(work) hard at it. Work hard at home.应如何翻译