This is the 4215th most frequent Chinese word.
士气
Morale.
In this sentence, '士气高昂' describes a state where the group feels enthusiastic and motivated due to a recent achievement.
由于团队成功完成了项目，士气高昂。
Due to the team's successful completion of the project, morale is high.
Here, '提升士气' indicates an active effort to improve or raise the mood and motivation of individuals or a group.
他试图用演讲来提升员工们的士气。
He attempted to boost the employees' morale with his speech.
'士气低落' in this case reflects the diminishing spirit and motivation within the team due to repeated challenges or setbacks.