I generally [usually] get up at six o 'clock.

我通常6点钟起床。

《新英汉大辞典》

I need your answer by six o 'clock tonight — otherwise we'll leave you out of it!

我必须在今晚六点前得到你的答复，否则我们就把你排除在外。

youdao

At six o 'clock he awoke, quietly lying on his back.

六点钟的时候，他醒了过来，静静地仰面躺着。

youdao