“士气”用英语怎么？

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morale    n. /məˈrɑːl/

the amount of confidence felt by a person or group of people, especially when in a dangerous or difficult situation
(尤指险境或困境下的)士气，精神面貌

raise everyone's morale
提高大家的士气

A couple of victories would improve the team's morale enormously.

几次胜利会极大提高队伍的士气。

There have been a lot of job losses recently so morale is fairly low.

近来裁员很多，所以士气很低。