Either he could not come or he did not want to.

他要么是不能来要么就是不想来。

《牛津词典》

He must like her, or he wouldn't keep calling her.

他一定喜欢她，不然他不会老给她打电话。

《牛津词典》

Either he went through with this thing or he did not; it was all or nothing.

他要么把这件事做完，要么就不做，只有这两种选择。

《柯林斯英汉双解大词典》

Or he missed them. He had decided he did not like the music of the big bands.

VOA: special.2009.05.03

Don't fail him or he will drive you out just as he drove out the Canaanites. That's a theme in Deuteronomy.

不要让他失望，否则他也会驱逐你,就如同他驱逐迦南人，这是《申命记》的一个主题。

耶鲁公开课 - 旧约导论课程节选

And it was like all his drawings of things that he accomplished, or like he didn't actually get to yet,

展览中有他所有完成或未完成的作品，

艺术画廊，来吧 - SpeakingMax英语口语达人

Clearly Mr. Noer is not a strong man, or he would not have made such comments.

FORBES: Readers Say

Or he could be wrong: it could be going down a teeny weeny bit.

BBC: Global warming: Andrew Pendleton and James Delingpole

Or he must make a full-throated defense of British membership that categorically rules out an exit.

WSJ: The EU Waiting Game Is Over For Cameron