Tranquil /ˈtræŋ.kwɪl/ adj. 安静的,平静的;安宁的
meaning: calm and peaceful and without noise, violence, worry, etc.
1) 前缀:tran-表示trans- 转变(Transformers, transport).
2) 词根:quil- 安静(quiet)
e.g. She stared at the tranquil surface of the water. 她凝视着平静的水面。
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