短语词组短语sahelian drought 萨赫尔干旱Ray Sahelian 莎赫莱恩Africa Sahelian belt 非洲萨哈尔带UNSO United Nation Sahelian Office 联合国萨赫勒办公室Office for Sahelian Relief Operations 萨赫勒区域救济业务处un sudano sahelian office unso 联合国苏丹萨赫勒办事处 返回 Sahelian