firewalln.
'faɪɚwɔl
中文n. 防火墙\nvt. 用作防火墙
防火墙
vt. 用作防火墙
词根词源
firewall (n.)also fire-wall, 1851 as a physical wall meant to prevent the spread of fire in a structure, from fire (n.) + wall (n.). Computer sense (originally figurative) is by 1990.
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