At 4, but I have to leave by 3:00 to get there on time.
四点,不过我三点必须离开,才能准时到那里。
Nature will have its course.
天行其道。
OK. We can get some more tomorrow. We should finish the floor now. Can you take the other end of this piece of wood? Now you have to pull it to make the surface smooth like that.