In order to efficiently express 3D objects in the actual world, especially, coal beds, a new method of 3D based on set theory was proposed after analyzing complicated 3D data of coal beds.是什么意思_In order to efficiently express 3D objects in the actual world, especially, coal beds, a new method of 3D based on set theory was proposed after analyzing complicated 3D data of coal beds.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句