I thanked them for their long and loyal service.

我感谢他们长期忠诚的效力。

《柯林斯英汉双解大词典》

I thanked them for the many kindness.

我感谢他们多我的许多帮助。

youdao

I thanked them for their munificence.

我感谢他们的慷慨。

youdao

If there were any neighbors visible, I would have thanked them.

NPR: Chapter 1

I, of course, wrote back and thanked the company for its graciousness and assured the support team that I'd be using them for all future travel overseas.

ENGADGET: The extremes of technology customer service: how common sense and empathy create unmatched loyalty