铜墙铁壁

tóng qiáng tiě bì

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Definitions

  1. 1. copper wall, iron bastion (idiom); impenetrable defense

Child Words of 铜墙铁壁

墙
qiáng

wall

铜
tóng

copper (chemistry)

铁
tiě

iron (metal)

壁
bì

wall