foothill的复数形式怎么写

Dingxi Prefecture is located in the foothill of the Loess Plateau climate is arid or semi - arid.位于黄土高原丘陵沟壑干旱半干旱区的甘肃省定西地区,面临生态恶劣和经济贫困的双重危机.The scent of pine and the sound of crickets floated down from the foothill Appala...

foothill的音标：foothill的英式发音音标为：['fʊthɪl]foothill的美式发音音标为：['fʊtˌhɪl]...

n.山麓，小丘...