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。