爆破层；(防空洞上的)坚固覆盖层。的英文

bursting layer

• 爆破:    blow up; blast; bu ...
• 层:    I storey; tier; st ...
• 防空洞:    air-raid shelter; ...
• 上:    upper; up; upward
• 的:    4次方是 The fourth po ...
• 坚固:    firm; solid; sturd ...
• 覆盖层:    overburden; supers ...