I tend to forget things unless I mark them down.

我常常会忘事，除非我把它们记下来。

《柯林斯英汉双解大词典》

But it was never in me to give up, because I realized that I was never going to be successful unless I got an education.

但我从来没有放弃过，因为我意识到，除非我接受了教育，否则我永远不会成功。

youdao

She will eat me unless I have a mobile phone to call for help.

除非我有手机来求救，否则她会吃掉我的。

youdao

I did not intend to fight unless it became necessary in self-defense and in the performance of official duty.

VOA: special.2010.02.15

In other words, you are an end and not a means to me unless in fact I'm exploiting you and instrumentalizing you. Right?

换言之，对我来说，你不是手段，而是目的,除非我在剥削你，或把你工具化，是吧？

耶鲁公开课 - 文学理论导论课程节选

I have never had any myself and I don't plan to unless I need to maybe in the future.

我自己没有整过。在将来，除非有必要，我也不打算去整容。

整容是个人自由 - SpeakingMax英语口语达人

But, how could I know if meggings were for me unless I actually tried them on?

CNN: Apparently This Matters: Meggings

So, unless I whipped out my credit card, I was literally unable to make a move.

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I've never taken one, and doubt I will unless I'm hard up for a column.

WSJ: Yielding With a Purpose