They should only be deployed in a defensive role!

他们应该仅仅起防御作用！

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Gas can promote the metabolism, thermal effect, a defensive role, solid oxygen effect and gasification.

气具有促进代谢作用，温热作用，防御作用，固摄作用和气化作用。

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Playing in a largely defensive role in midfield, Beckham displayed a few good touches with his famous right foot before being replaced by Mathieu Flamini.

在中场右路扮演了很重要的防守角色，在被弗拉米尼换下场前，贝克·汉姆有名的右脚极有威胁性。

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James's defensive efforts played a key role, too.

WSJ: Knicks Overcome by the Heat

Since then Nato has used its defensive role to justify a more proactive approach to "out of area" activities - arguing that instability in any part of Europe would constitute a threat to its members.

BBC: Profile: Nato

On-loan Liverpool youngster Ayala was more assured in his regular defensive role, denying Alberto Bueno a sight of goal before he opened the scoring himself on 43 minutes.

BBC: Hull 2-0 Derby