Officials in the Democratic Republic of Congo have launched a scheme to reduce the number of illegal weapons in the east of the country by offering 50 dollars for each one that is handed in. But a BBC correspondent in Kinshasa says this campaign may prove counter-productive as the money gunner owners receive for their weapons would allow them to buy two more on the black market.

刚果民主共和国发起了旨在减少该国东部非法武器的行动，向每一支上缴的武器提供50美元。但是金沙萨一名BBC记者表示，这项运动会产生适得其反的效果，因为持枪者因上缴武器收到的钱足够在黑市场重新购买两支武器。




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.