Repairs are necessary to strengthen the bridge.
这座桥需要加固。
To improve the quality of life through work, two complementary strategies are necessary.
要通过工作提高生活质量，两个互补的策略很必要。
交换是必要的。
有两个步骤是必要的。
Two or three friends, a small tent, sleeping bags, food and drink are necessary.
两三个朋友、一个小帐篷、睡袋，还有食物和饮料都是必要的。
Both physical fitness and mental attitude are necessary factors to be a successful sportsman.
身体素质和心态都是成为一名成功运动员的必要因素。
Responsibility and reliability are necessary qualifications, as well as a friendly and outgoing personality.
责任感和可靠性是必需的素质，友善和外向的性格也必不可少。
Thus some very dangerous drugs are approved because they are necessary to treat serious illnesses.
因此一些非常危险的药物被批准，因为它们是治疗严重疾病所必需的。
In order to know a foreign language thoroughly, four things are necessary.
为了完全掌握一门外语，有四点至关重要。
These reference books are necessary to us.
这些参考书是我们所必需的。
What kind of resources are necessary and in what amount.
何种资源是必需的，以及需要多大的量。
If you manage an office, consider whether all the activities of an office are necessary.
如果你管理着一个办公室你需要考虑是否这个办公室的所有活动都是必须的。
They have no control over these handling rules, but they are necessary for correct behavior.
这些添加对操作规则没有控制能力，但是他们对于正确的操作是必要的。
All are necessary for the development of complex systems.
所有的都是复杂系统开发所必要的。
But before that, some social experience and clients are necessary.
但是在那之前，一些社会经验和客户是非常必要的。
The element entities are necessary to permit domain specialization.
要允许域专门化元素实体是必需的。
Both are necessary for the band to sound good - strong collaboration and individual virtuosity.
强有力的协作和个人的精湛技艺都是出色的乐队表演所必需的。
On the other hand, sometimes such large changes are necessary.
另一方面，有些时候这类大的改动也会是必须的。
These are necessary for communicating project specifications and overall application flow.
这些工具对于交流项目规范和整体应用程序流是必要的。
Boundaries are necessary sometimes. Enforcing them takes a lot more effort than it ought to.
有时候，划分界限是有必要的，但执行起来却比预料中还要费力。
What's worse is that none of those tests are necessary, according to one expert.
更糟的是，据专家分析，这里面没有一种实验是必要的。
But they are necessary, right?
不过这是必须的不是吗？
These downloads are necessary to follow the steps provided in this article.
要完成本文中的步骤，这些下载是必需的。
Transactions are necessary to ensure a high degree of data integrity and consistency.
事务需要确保高度的数据完整性和一致性。
More formal processes are necessary as teams grow beyond quite small.
随着团队规模的增加，就需要更加规范的进程了。
What policies are necessary to guide the organization to meet its goals.
需要什么策略来指导组织满足其目标。
No manual configuration changes are necessary.
不需要手动修改配置。
It is worth questioning how many of the tests now conducted are necessary.
现在值得提出的是这种实验必须要进行多少次才能达到目的。
These are necessary adjustments.
这些都是必要的调整。
Both are necessary and should complement each other.
两者都是必需的，它们之间应该是相互补充的关系。
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