他们必须知道并遵守安全规则。
要保存一件物品，必须知道它是如何制作的。
One must know how one object was made in order to preserve it.
我们必须知道卡尔什么时候来，这样我们才能给他订个房间。
We must find out when Karl is coming, so we can book a room for him.
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 pools are expensive to build, and they usually take several years to complete.
你必须知道这些元音都应该加在哪，这使得学习如何阅读变得更加困难。
You have to know where the vowels are supposed to go, and that makes it harder to learn how to read.
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。
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.
要迁移该配置，您必须知道需要迁移什么设置。
To migrate the configuration, you must know what Settings need to be migrated.
当这不可能时，请求者必须知道请求并没有被处理。
When this is not possible, the requester must know that a request has not been processed.
虚拟化系统至少须知道有多少请求正在发送到系统。
At a minimum, a virtualization system must know how many requests are being sent into the system.
为此必须知道文件的正确结构，因此需要一个模式。
To determine that, you need to know the proper structure of the file. So, you need a schema.
您必须知道应用程序在何处如何与安全机制进行交互。
You have to know how and where applications interact with security apparatus.
这样的模型中，您必须知道需要的项到底在什么位置。
You're forced in that model to always know exactly where in the set the items you want are.
关键是你必须知道如何点燃对方的火花，然后与之所欲。
The key is to know what lights your partner's fire and deliver your love that way.
重要的是，你必须知道你有选择自己所遵循的想法的权利。
What is important to know is that you have a choice about the thoughts you follow.
作为交易者，如果想赚钱，你必须知道市场下一步怎么走。
To make money as a trader you have to know what the market is going to do next.
至少某些开发和评审代码的人必须知道如何编写安全的程序。
At least some of the people developing and reviewing the code must know how to write secure programs.
在你开启这个平衡生活的旅程之前你必须知道你在寻找什么。
Before you embark on this journey towards balanced living you must know what you are looking for.
调用处理程序类必须知道如何处理所有接口类型的方法调用。
The invocation handler class must know how to deal with method invocations of all the interface types.
但决策者在解决这一问题前，他们必须知道什么地方出了错。
But before policy makers can fix the problem, they have to understand what has gone wrong.
要了解事件发生的精确时间，还必须知道发生此事件的位置。
To know precisely what time an event occurs, it is also important to know the event's location.
摄影师必须知道如何使很宽的广角镜头固有的光学畸变最小化。
The photographer must know how to minimize the inherent optical distortion of a very wide Angle lens.
理想状态是，做决定时，你必须且只须知道那些最相关的事实。
Ideally, when it comes to making a decision, you should know the most relevant facts — and only those.
“规则是用来打破的”，但是你必须知道何时及如何去打破它们。
"Rules are made to be broken", but you have to know when and how to break them.
对于行集游标，JDBC1定位更新语法必须知道行集的存在。
For rowset cursors, the JDBC 1 positioned update syntax needs be aware of the rowset.
如果想把这些内容放到元素中，那么必须知道转换需要进行映射。
If you know you want this to be in a element, then you know that mapping must be made for the conversion.
你若想要移动，在重心体系中，你就必须知道，重心速度是多少。
If you ever want to move yourself to the center of mass, you will have to know what the center-of-mass velocity is.
如果你负责域安全的话，你必须知道什么信息在默认时就是可见的。
If you are responsible for domain security you need to know what information it is possible to see by default.
她们还必须知道恰当的收割时机，以及某块收割的田地何时再次丰收。
They also must time harvests and know when a certain depleted patch will regenerate and yield good harvest again.
她们还必须知道恰当的收割时机，以及某块收割的田地何时再次丰收。
They also must time harvests and know when a certain depleted patch will regenerate and yield good harvest again.
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