tranquil

形容词 tranquil:

1. (of a body of water) free from disturbance by heavy waves
   同义词：placid, quiet, still, smooth, unruffled
2. not agitated; without losing self-possession
   同义词：calm, unagitated, serene

1. He looked at the man with a tranquil eye.
   他以平静的眼神看着那个男人。
2. A calm or tranquil state of mind; self-possession.
   冷静，沉着头脑镇定或沉着的状态; 自我克制
3. Both my husband and I love the tranquil life in the country.
   我丈夫和我都喜欢乡村的宁静生活。