有必要的英文：
to be necessary

參考例句：
  • Definitely more independent corroboration is necessary.
    有必要更明確地進一步證實。
  • There is a need for a curb on downloading papers.
    有必要抑制下載論文的勢頭。
  • The change in his illness indicates the use of stronger drugs.
    他疾病的變化有必要使用猛一些的藥。
  • Always proofread completed letters very carefully.Consult dictionary when necessary or in doubt.
    完成的書信一定要很小心地校對，有必要或懷疑時查典。
  • Environmental groups say action is needed to find clean, renewable energy sources.
    環(huán)境組織表示有必要采取措施尋找干凈的、可恢復(fù)的能源。
  • There are calls for the case to be retried.
    該案有必要重審.
  • It's necessary to rebuild our alma mater.
    有必要重建我們的母校。
  • In this case surgery is indicated.
    這種病例有必要動手術(shù)。
  • The most northerly races have to be transferred southwards
    最北的種族有必要南移。
  • Do you have to slam the door?
    你有必要摔門嗎?
necessary是什么意思：
adj. 必要的；必需的；必然的；不可避免的
n. 必需品
  • It is necessary to delimit the anomaly clearly.
    清楚地圈定異常是必要的。
  • The redress of mistakes is necessary.
    糾錯是必要的。
  • It's necessary to operate on him.
    必須給他做手術(shù)。
  • Cases it deems necessary to try.
    認為應(yīng)當由本院審理的案件。
  • It is necessary to delimitate the anomaly clearly.
    清楚地圈定異常是必要的。

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