An international aid group is calling for an overhaul of the world's food system, saying prices for staples such as corn will double in the next 20 years.
一个国际援助组织呼吁对世界粮食系统进行全面检查，称诸如玉米等主要食品粮食的价格将会在未来20年内翻倍。
Immigration officials also defend the fee system, saying it provides spending flexibility, since revenues go up in proportion to any rise in applications.
移民局官员同样也维护该收费系统，认为它可以提供支出的灵活性，因为随着移民申请数量的增加相应的收入也会提高。
Immigration officials also defend the fee system, saying it provides spending flexibility, since revenues go up in proportion to any rise in applications.
移民局官员同样也维护该收费系统，认为它可以提供支出的灵活性，因为随着移民申请数量的增加相应的收入也会提高。
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