affirmation和appreciation有区别吗

affirmation

[不可数名词, 可数名词]She nodded in affirmation.

她肯定地点了点头。

appreciation

[不可数名词] pleasure that you have when you recognize and enjoy the good qualities of sb/sth 欣赏

She shows little appreciation of good music.

她感受不到美好音乐的妙处。

The crowd murmured in appreciation .

人群低声赞叹着。

[不可数名词, 单数] ~ of sth a full or sympathetic understanding of sth, such as a situation or a problem, and of what it involves 理解；体谅；同情

I had no appreciation of the problems they faced.

我没有体谅到他们所面临的困难。

[不可数名词] ~ (of/for sth) the feeling of being grateful for sth 感激；感谢

Please accept this gift in appreciation of all you've done for us.

承蒙鼎力相助，不胜感激，谨备薄礼，敬请笑纳。

这两个词本意就不同，可能只是再某个语境下让你觉得它们意思相同。这种辨析还是弄清楚词的本意比较好。然后多看例句。