抑或

wǒ bù zhī tā men shì zàn chéng yì huò shì fǎn duì

我不知他们是赞成，抑或是反对。

I wonder if they are for or against this.

tā men shì lái yì huò shì bù lái hái shàng wèi kě zhī

他们是来，抑或是不来，还尚未可知。

It's not clear yet whether they will come or not.