relaxations的中文翻译是什么意思

Playing the piano is one of his favourite relaxations.

弹钢琴是他喜爱的一种消遣.

Playing the paino is one of his favourite relaxations.

弹钢琴是他最喜爱的消遣之一.

We develop several formulations of the maximum failure cost problem and present relaxations for them.

我们建立了几种最大失灵成本的模型并讨论他们的松弛问题.