I promised him that I'd stay sober tonight.

我答应过他，今晚我不会喝醉。

There are plenty of reasons to stay sober.

我们有足够的理由保持头脑清醒。

Can't we stay sober in front of our own culture?

人们难道就不能清醒点面对自己的文化么？

Yes, please, but I must make this the last one, I want to stay sober.

好啊，不过，这是最后一杯了，我想保持清醒。

Stay sober but pretend to be drunk, and stay awake but pretend to be asleep.

保持清醒，但假装喝醉了；保持警觉，但假装睡着了。