A mother may nag her son constantly about his grades or cleaning his room.

一个母亲可能会不停的唠叨，叫她的儿子好好学习，或者收拾屋子。

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But Rajat Nag, a top official at the Asian Development Bank, may have gotten it right when he said, the era of cheap food is over.

NPR: Global Outcry Over Rising Food Prices