This structure must be stable.
這種結構一定很穩固。
Accurate records must be kept.
必須保存準確的記錄。
You simply must read this book.
這本書你可一定要看一看。
We must work together, brothers!
我們必須攜手工作，伙計們！
We must set realistic goals.
我們必須制訂可實現的目標。
I must admit I am impressed.
我得承認我很佩服。
You must get home before curfew.
你必須在實行宵禁以前回到家中。