辞职信用英语怎么说？

辞职信

...a letter of resignation...

letter

n. 信，证书，许可证，字母，文字，字面意义；vt. 用字母标明，写字母于，加标题；vi. 写印刷体字母；

例句
Naylor acknowledged, in a letter to the judge, that he was a drug addict...
内勒在给法官的信中承认自己吸毒。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

resignation

n. 辞职，辞职书，顺从，听从；

例句
The President's resignation appears to be an acknowledgment that he has lost all hope of keeping the country together...
总统的辞职似乎表明他对维护国家稳定已不抱任何希望。