否定形式的音标: mustn't [ˈmʌsnt]
You mustn't take photos in here.

此处严禁拍照。

You mustn't leave the gate open.

你一定不要让大门敞开着。

You mustn't say things like that.

你千万别说那样的话。

We mustn't get bogged down in details.

我们一定不能因细节问题误事。

We mustn't let up now.

我们现在可不能放松啊。