Yuánzéshàng wǒmen tóngyì zhè ge fāng'àn.
In principle we agree to this proposal.
Yuánzéshàng bù néng tuìkuǎn, dàn kěyǐ huànhuò.
As a rule refunds aren't allowed, but exchanges are fine.
Yuánzéshàng měi rén xiàn mǎi liǎng zhāng.
In principle each person may buy two tickets at most.
