我们在一个宁静的花园里度过了下午。

We spent the afternoon in a ___tranquil garden.

然而，不幸的是，这个宁静的天堂年复一年地被无控制的旅游业摧毁了。

Unfortunately, though, this ___tranquil paradise has been destroyed year by year by uncontrolled tourism.

暴风雨过后，湖泊恢复了宁静的状态。

After the storm passed, the lake returned to a ___tranquil state.