词汇与表达：serene-tranquil

serene  [səˈriːn]
Someone or something that is serene is calm and quiet.         
She looked as calm and serene as she always did..
她看上去和以往一样平静安详。

tranquil
Something that is tranquil is calm and peaceful.
The tranquil atmosphere of The Connaught allows guests to feel totally at home...
康诺特酒店的宁静氛围让客人完全找到了宾至如归的感觉。