短语词组短语steeply y dipping raise 急倾斜上山steeply dipping raise 急倾斜上山steeply dipping coal seam 大倾角煤层steeply dipping narrow deposits 急倾斜薄矿体steeply dipping zone 陡立地层带steeply dipping bed 斜浸床steeply dipping seams 大倾角煤层 返回 steeply dipping