opencast發音形容詞1露天開採的、露天的英式；礦業The village sits close to a large opencast coal mine.那座村莊就在一座大型露天煤礦附近。副詞1以露天方式英式；礦業Most of the copper here is mined opencast.這裡的銅礦大多以露天方式開採。名詞1露天礦、露天開採英式Local residents opposed plans for a new opencast near the river.當地居民反對在河邊開設新露天礦的計畫。