valediction

他在信的结尾处写下了'此致敬礼'作为结束语。

He wrote 'Best regards' as the ___valediction at the end of the letter.

校长在毕业典礼上的告别辞感动了所有人。

The principal's ___valediction at the graduation ceremony moved everyone.

在退休派对上，经理的告别致辞让所有同事都感动不已。

At the retirement party, the manager's ___valediction touched all the colleagues deeply.