Definition
Used to give advice, indicating that someone should do something.
应该
You want to submit your application before the deadline.
你应该在截止日期前提交你的申请。
She wants to exercise more if she wants to improve her health.
如果她想改善健康，她应该多运动。
You want to subscribe to the newsletter so you don't miss any updates.
你应该订阅电子报，这样你就不会错过任何更新。