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hand something↔in (to somebody): to give something to a person in authority, especially a piece of work or something that is lost 提交,呈交,上交(尤指书面材料或失物)
You must all hand in your projects by the end of next week. 你们都必须在下周末前交出研究报告.
I handed the watch in to the police. 我把那块表交给了警察.
to hand in your notice/resignation(= formally tell your employer that you want to stop working for them) 递交辞呈
counterproductive: having the opposite effect to the one which was intended 产生相反效果;事与愿违;适得其反
Increases in taxation would be counterproductive. 多征税的效果会适得其反.
