英语语法分析

I then realized that he had made a simple but excusable historical mistake.

我后来认识到他犯了一个简单但可原谅的历史错误。

《柯林斯英汉双解大词典》

Doing it once was just about excusable — doing it twice was certainly not.

这种事干一次也许还可以原谅，干两次就绝对不能了。

《牛津词典》

This is an excusable mistake.

这是个可原谅的错误。