necessary详尽意思

1. 必要的，必须的，必需的，不可缺少的，有必要，需要
2. 必然的，无法避免的，不可避免的，必定的，不得已的，事出无奈
3. 强迫的
4. 应该
5. 一定

1. （生活）必需品，必要的物品
2. 厕所
3. 钱，收入，必需的金钱（与the连用）

1. 必要的,必需的 essential for a purpose; that cannot be done without or avoided
2. 必然的,不可避免的 that must be; inevitable

1. 必需的：注:*有限应用(limited applicability),**适宜的(suitable),***有重要价值(important),****必需的(necessary)损伤等级(AIS) 为使肌体损伤程度达到量化,美国机动交通医学会(1990)制定了损伤分级标准,如表2所示.

2. 必须的：二、花费是常见的(ordinary)和必须的(necessary). 「常见的」定义是,其花费在行业内、商业上很平常,被业者广泛接受. 「必须的」的定义是该花费对生意很有帮助. 这里的关键因素是旅行的主要目的是商业,其中穿插几天游玩也可视为常见的.

3. 必需品：2、 商品满足需要的属性:奢侈品(luxury)的需求,对价格是有弹性的,而必需品(necessary)是缺乏弹性的.

1. My money came short of the necessary sum.
   我的钱不足所需的数目。
2. Do you have the necessary skills for this job?
   你具备做这项工作所必需的技能吗?
3. They joined the wires and made the necessary new connection.
   他们把电线接了起来,接通了所需的新线路。
4. I'll leave it to you make the necessary arrangements.
   我将让你作出必要的安排。
5. The lawyers will draw up all the necessary papers.
   律师们将拟定出所有必要的文件。
6. No one foresees how the necessary restriction of the population will be effected.
   任何人都无法预知将如何实现对人口的必要限制。
7. They will meet in Beijing to debate taking necessary actions against environmental pollution.
   他们将在北京会晤并讨论采取必要措施防止环境污染。

1. A year's guarantee on the television set for all repairs might be necessary.
   必须为电视机提供为期一年免费修理的保单。
2. A climber must learn to discriminate as to when compass bearings are necessary and when they are not.
   一个登山者必须学会辨别什么时候需要罗盘测定方位,什么时候不需要。
3. Under certain conditions, answering back sarcastically is necessary.
   在某种情况下,反唇相讥是必要的。

1. Patience and understanding are necessary for a teacher of infants.
   耐心和理解是幼儿教师必不可少的。
2. What is necessary for one person is not always necessary for another.
   对某人来说是必需的东西,对别人则未必如此。
3. These reference books are necessary to scientists.
   这些参考书是科学工作者所必需的。
4. Sleep is necessary to one's health.
   睡眠对健康是必要的。

1. It was necessary to jump on the ice coated mounds of brush several times before they could flush.
   你得在这些被冰覆盖的树丛上跳上好几下,才能把它们惊起。
2. It's necessary to raise wages on the basis of increasing production.
   需要在增加生产的基础上增加工资。
3. Because the company was doing more business, it was necessary to expand the factory.
   由于公司业务的扩大,扩大工厂是必然的。
4. It was necessary to retire several generals who lacked energy and enterprise.
   使几位缺乏精力和上进心的将军解职是必要的。
5. It is sometimes necessary to indulge a sick child.
   迁就一个生病的小孩有时是必要的。
6. It is both important and necessary to note this difference.
   注意到这个差别是重要的和必要的。
7. Is it really necessary for me to attend the meeting?
   我真的必须出席会议吗?
8. It's necessary for us to net the currant bushes.
   我们有必要用网盖上红醋栗树。
9. It is necessary for them to decide on which type of fuel is most suitable.
   他们必须决定哪一种燃料最合适。

1. It is necessary that everyone be there in time.
   大家都按时到达那里是必要的。
2. It's necessary that young and old people should communicate more with each other.
   年轻人和老年人有必要保持更多的联系。

1. We consider it necessary that the machine should be oiled regularly.
   我们认为机器必须定期加油。
2. This has made it necessary for agriculture and industry to develop very quickly.
   这就使得工农业必须飞速发展。
3. I felt it necessary to speak about our shortcomings.
   我觉得有必要谈谈我们的缺点。
4. Some students hold it necessary to be able to speak English.
   有些学生认为能讲英语是非常必要的。

1. The National People's Congress holds one session each year. When necessary, the session may be advanced or postponed.
   全国人民代表大会每年召开一次会议,必要时,会期可以提前或推迟。
2. If necessary, the heavy machinery can be brought into action.
   若有必要,可以使用重型机械。
3. If necessary,I'll go there again.
   如有必要,我会再去那里的。

a necessary evil

不得不认可的不合意甚至有害的事物 thing that is undesirable and possibly harmful but must be accepted for practical reasons

1. necessary用作形容词时,表示“必要的,必然的”,一般指在概念和逻辑上所要求应该做的,本身包含着“既不可少,又不可避免的”的意思。作“不可避免”解时,常用于a necessary evil习语中。
2. necessary可用作定语、表语或宾语补足语。necessary一般不用表示人的名词或代词作其主语,而通常要用it作形式主语。
3. It is necessary可以接由that引导的主语从句,从句中的谓语动词一般要用虚拟式(多为动词原形)。
4. 有时为了使句子意思完整, necessary可以同if, when连用,用作插入语。