短語詞組短語bottom supporting platform 底層支持平臺bottom founded platform 底底式平臺bottom -dump platform 活底板吊框bottom sitting drilling platform 坐底式鉆井船sloping -bottom platform 斜坡平臺bottom supporting drilling platform 定柱沉墊式鉆井平臺;坐底式鉆井平臺platform bottom 收割臺底板 返回 bottom platform