This structure must be stable.
这种结构一定很稳固。
Accurate records must be kept.
必须保存准确的记录。
You simply must read this book.
这本书你可一定要看一看。
We must work together, brothers!
我们必须携手工作，伙计们！
We must set realistic goals.
我们必须制订可实现的目标。
I must admit I am impressed.
我得承认我很佩服。
You must get home before curfew.
你必须在实行宵禁以前回到家中。