She put up her fire wall, trying to hide behind it.
她竖起火墙，想躲在后面。
英英词典
fire wall n.
(colloquial) the application of maximum thrust
synonymous： firewall
(computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet
synonymous： firewall
a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle