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necessary

adjective
 OPAL W
🔊/ˈnesəsəri/
🔊/ˈnesəseri/
Idioms
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  1.  
     that is needed for a purpose or a reason必需的；必要的 synonym essential
    • necessary to do something It may be necessary to buy a new one.也许有必要买个新的了。🔊🔊
    • necessary for somebody to do something It doesn't seem necessary for us to meet.我们似乎没必要见面。🔊🔊
    • necessary for something Food is necessary for survival.食物是生存所必需的。
    • I'll make the necessary arrangements.我会做一些必要的安排。🔊🔊
    • Radical change was a necessary step for reform.彻底改变是改革的必要步骤。
    • if necessary If necessary, you can contact me at home.必要的话，我在家时你也可以和我联系。🔊🔊
    • when necessary Only use your car when absolutely necessary.非用不可的时候才用你的汽车。🔊🔊
    • where necessary Changes can easily be made where necessary.必要时可以轻松进行更改。
    • He has the expertise necessary to make it work.他具有使其工作必不可少的专业知识。
    • I was determined not to stay in hospital for any longer than was strictly necessary.我决定， 除非极为必要， 否则决不在医院多呆一天。
    Extra Examples
    • She has the qualities necessary to be a successful teacher.她具备成为一名成功的老师所必需的素质。
    • The owner failed to take the steps necessary to ensure the residents' safety.业主没有采取必要的步骤来确保居民的安全。
    • Make any alterations you consider necessary.你认为有必要的都可以修改。
    • The cold weather has made it necessary to protect the crops.天气寒冷，庄稼必须加以保护。
    • These measures will be enforced, if necessary, by the army.如果必要，军队会强制执行这些措施。
    • We are here to give help and support when necessary.如有需要，我们随时提供帮助和支援。
    • You may find it necessary to readjust the wheels from time to time.你可能会发现不时调整轮子很有必要。
    • qualifications which are necessary for work with the under-fives照顾 5 岁以下儿童必需的资格
    Oxford Collocations Dictionaryverbs
    • appear
    • be
    • prove
    • …
    adverb
    • really
    • strictly
    • absolutely
    • …
    preposition
    • for
    phrases
    • if necessary
    • as necessary
    • when necessary
    • …
    See full entry
  2.  
     [only before noun] that must exist or happen and cannot be avoided必然的；无法避免的 synonym inevitable
    • This is a necessary consequence of progress.这是事情发展的必然后果。🔊🔊
    • A necessary condition for a steep fall in demand is a widespread collapse in confidence.要使需求陡降，一个必要条件是人们普遍丧失信心。
    Topics Permission and obligationb2
    3. Word Originlate Middle English: from Latin necessarius, from necesse ‘be needful’.
Idioms
a necessary evil
  1. a thing that is bad or that you do not like but that you must accept for a particular reason无法避免的坏事；不得已的事
    • The loss of jobs is regarded as a necessary evil in the fight against inflation.失业被认为是与通货膨胀作斗争的必要邪恶。