n.高兴；快活
Our friends have a look of cheerfulness. 我们的朋友看上去很高兴。
Cheerfulness doesn't always imply happiness. 快活并不总是意味着幸福。
In your latest books, the sense of menace has receded, and the prevailing atmosphere is one of quasi mathematical, geometric cheerfulness. 在你最近出版的书中，危机感有所减退，但是占主要地位的是一种类似数学的，几何学的快活。
