It's from my boyfriend, if you must know.
倘使你一定要知道的话，这是我男朋友给的。
You must know him—he's an institution around here!
你一定认识他—他是这一带的知名人士！
It scared the hell out of her, if you must know. And me, too.
这把她的魂都吓飞了，如果你一定要知道的话。而且我也被吓坏了。
I must know something about him.
我必须了解一下他。
You must know when to fly or cancel the flight.
你必须知道航班什么时候起飞或取消。
We must know some advice about protecting ourselves.
我们必须知道一些关于保护自己的建议。
Students must know how to sail before they join the ship.
学生们在上船前必须知道如何航行。
"It is strange though, for she must know," he said to himself.
“这可真奇怪，因为她一定知道的。”他自言自语地说。
She felt somehow that everybody who knew the moor must know Dickon.
不知怎的，她总觉得知道荒野的人，肯定都知道狄肯。
I have never thought so myself; and no one must know it now if I am so.
我自己从来没有这样想过；如果我是的话，现在谁也不能知道。
The miller's house was close by, and the miller, you must know, had a very beautiful daughter.
磨坊主的房子就在附近，而且你得知道，磨坊主有一个非常漂亮的女儿。
She must know the play backwards by now.
她现在对这个剧本肯定是倒背如流。
They must know and obey the safety rules.
他们必须知道并遵守安全规则。
You must know the lab rules before the first lab lessons.
在上第一堂实验课之前，你必须了解实验规则。
One must know how one object was made in order to preserve it.
要保存一件物品，必须知道它是如何制作的。
Students must know the value of exercise because it plays a necessary part in counterbalancing the stress responses produced in our bodies by having to meet exams.
学生们必须知道锻炼的价值，因为它对平衡我们体内因面临考试而产生的压力反应起着必要的作用。
She must know a lot about cooking.
她一定很懂烹饪。
You must know that pools are expensive to build, and they usually take several years to complete.
你必须知道建造游泳池是很昂贵的，而且通常需要几年的时间来完成。
You must know that, in the storm which swamped my boat, a large ship also suffered the same fate.
你一定知道，在这场淹没了我的小船的风暴中，一艘大船也遭受了同样的命运。
If you must know, I feel terrible.
如果你一定要知道的话，我感觉糟透了。
但是首先，他们必须知道。
You must know that we have parents.
你们应当知道，我们是有双亲的人。
One must know how to understand him.
我们应当知道怎样去领会他。
You must know how to motivate yourself.
你得知道怎样自我激励。
这是你必须了解的。
To reach a destination, you must know it.
为了达到目标，你得知道目标。
But you must know the place to go without.
可是你要知道你要去的地方可能就不是这样的了。
你一定知道。
First, you must know how to write a good test.
首先，您必须了解如何书写一个好的测试。
First, you must know how to write a good test.
首先，您必须了解如何书写一个好的测试。
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