摘要：Joe got up and left without a word of thanks. (乔站起来，没有说一句谢谢就走了。) [朗文当代英语辞典]

thanks是仅复数名词，a word of thanks的of thanks丰富word的性质。

a word of thanks的含义是“感谢的一句话”、“一句感谢的话”，如

【例句1】He took the book without a word of thanks. (他一句感谢的话也没说就把书拿走了。)[牛津高级学者辞典]

【例句2】Joe got up and left without a word of thanks. (乔站起来，没有说一句谢谢就走了。) [朗文当代英语辞典]

对肯定语义，word可以复数，如

【例句3】They accepted their certificates with words of thanks. (他们接受了证书，并表示感谢。) [柯林斯高级学者词典]

“一封感谢信”是a letter of thanks, 如

【例句4】He wrote a letter of thanks to the hospital. (他给医院写了一封感谢信。)[剑桥高级学者辞典]

来源：菲汐布