engagement

她炫耀着自己闪闪发光的订婚戒指。

She shows off her sparkling ___engagement ring.

他们在社交媒体上公布了订婚的消息。

They announced their ___engagement on social media.

我们的部队在边境交战中损失了三名士兵。

Our troops lost three soldiers in the border ___engagement.