By that time the new system should be up and running.
到那时这个新系统应该会运转起来了。
Many people feel that the law should be changed.
许多人都觉得这项法律应该修改。
The treatment should be repeated every two to three hours.
这种治疗方法应该每隔两到三小时重复一次。
I think we should go back to first principles.
我认为我们应该回到基本原则上。
You should not go out in the heat of the day.
你不应该在天最热的时候外出。