Sometimes it is necessary to say no.
有时候说“不”是必要的。
Repairs are necessary to strengthen the bridge.
这座桥需要加固。
For her, books were as necessary to life as bread.
对她来说，书就像面包一样是生活的必需。
It has been found necessary to make some cuts in the text.
已发现有必要对文章作些删节。
It is not always necessary to gut the fish prior to freezing.
在冷冻鱼之前没有必要总是取出其内脏。
They've been deprived of the fuel necessary to heat their homes.
他们无法得到住房取暖必需的燃料。
It may also be necessary to get a new appraisal of the property.
可能还需要对该房产做个新的估价。
It is always necessary to have regard to the terms of the contract.
记住合同条款总是必要的。
He had the ruthless streak necessary to carry him into the cabinet.
他有着跻身内阁所必需的冷酷品性。
I kept the engine running because it might be necessary to leave fast.
我让发动机一直开着，因为可能需要快速离开。
I don't think it's necessary to start so early.
我认为没有必要这么早就开始。
It is no longer necessary to dress like everyone else.
没必要穿得和别人一样。
It is not necessary to enroll before the course starts.
不需要在课程开始前注册。
It is not necessary to set down the rest of the oration.
没有必要把这篇演说的其余部分写下来。
At the outset, it seemed necessary to be on guard against the other two.
一开始，似乎有必要提防另外两个。
It appears necessary to learn something useful to protect the family from them.
学习一些有用的东西来保护家庭免受它们的伤害似乎是很有必要的。
It isn't necessary to know anything about sailing—students can learn on the ship.
没有必要知道任何有关航海的知识——学生们可以在船上学到。
When traveling abroad, it is very necessary to bring some foreign currency with you.
去国外旅行时候，随身携带一些外国货币是很有必要的。
In order to master grammar knowledge, it is necessary to practice as much as possible.
为了掌握语法知识，尽可能多做练习是有必要的。
Effective communication is necessary to instruct your dog about what you want it to do.
有效的沟通是必要的，这让你的狗狗明白你想让它做什么。
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。
It may be necessary to buy a new one.
也许有必要买个新的了。
She found it necessary to reassert her position.
她觉得有必要重申她的立场。
Vitamin D is necessary to aid the absorption of calcium from food.
从食物中吸取钙需靠维生素D的帮助。
It might be necessary to make a few slight modifications to the design.
也许有必要对这个设计稍作几处修改。
It was necessary to discover the truth or otherwise of these statements.
有必要查证这些说法的真实性或虚假性。
They are only doing what is necessary to prevent wholesale destruction of vegetation.
他们只是在做为防止植被遭大规模破坏而必须做的事情。
Recent findings, however, make it necessary to reverse this picture.
然而，最近的研究发现，有必要扭转这一局面。
It's necessary to create more low-emission zones as soon as possible.
有必要尽快建立更多的低排放区。
It is necessary to do further study and development on the pine cone.
有必要对松果进行进一步的研究和开发。
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