Your behavior is a little excessive, but it is excusable.

你的行为虽说有点过分，但是可以原谅。

Lucy made an excusable mistake, but she still blamed herself.

露西犯了个可原谅的错误，但是她还是很自责。

Your fault is excusable, but you should learn from it.

你的过错可以谅解，但是你要引以为戒。

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。

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。

This is an excusable mistake.

这是个可原谅的错误。

Well, that mistake is excusable.

这个错误还可以原谅。

Seeing that he is so young, that is excusable.

鉴于他如此年轻， 这是可以原谅的。