穴 开槽刨 腔 腔背 中空 中空的的英文

hollow

• 穴:    cave; cavern; grot ...
• 开槽:    open slot; notch; ...
• 刨:    dig; excavate
• 腔:    cavity; chamber
• 腔背:    back lining; hollo ...
• 中空:    cavity; medium alt ...
• 的:    4次方是 The fourth po ...