防空洞

fangˊ kong ˉ dongˋ

(Air-raid) Air-raid shelter | Air-raid bunker

防空 fangˊ kongˉ

(Air defence, Anti-aircraft) Air defence, Anti-aircraft

空洞 kongˉ dongˋ

(Empty, Inane, Meaningless, Shallow) Empty vastness, Empty, Shallow, Meaningless, Inane

Defend

Defensive

Guard

Look after

Protect

Air

Bare

Deserted

Empty

Have free time

Hollow

In vain

Sky

Space

Cave

Cavern

Cavity

Hole

Pierce

See through

Understand

Zero

防空

Air defence

Anti-aircraft

空洞

Empty

Inane

Meaningless

Shallow

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