sedateness

例句：

1. 1. Shewas so calm during the storm that shedidn't panic.
   暴风雨中她非常镇定，没有惊慌失措。
2. 2. The captainwas composed in the face of danger.
   船长在危险面前保持镇定。
3. 3. Theold man had a composedness about him that made everyonerespect him.
   老人的沉着让每个人都尊敬他。