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汉语拼音：bì yào

不可缺少；非这样不行：开展批评和自我批评是十分～的。为了集体的利益，～时可以牺牲个人的利益。

1. 非这样不行；不可缺少的。

   《二刻拍案惊奇》卷二一：“即差快手 李彪 随着 王爵 跟捕贼人，必要擒获，方準销牌。”《二十年目睹之怪现状》：“以后他再问你，你必要叫他同我商量。” 李国文 《月食》：“他没有必要陷入这样的困境。”

• This may seem like a bit of a balancing act, but it is necessary for effective software delivery.

  这看起来有点像在搞平衡，但是对于有效的软件交付来说是有必要的。

• Classification learning is often necessary when the decisions made by the algorithm will be required as input somewhere else.

  如果通过算法作出的决定需要输入别的地方，这时分类学习是必要的。

• It seems unnecessary for us to tell you to be of good cheer, but we say it anyway. We surround you with love. Good day, dear friends.

  看起来没有必要让我们告诉你不要垂头丧气，但我们还是说了。我们伴随着爱围绕在你身边。祝你美好的一天，亲爱的朋友们。

• But in a pinch, it's good to know how things stack up in the aisles of your local grocery store.

  但是必要时，最好是知道堆放在当地杂货铺走廊里的那些东西是什么。

• From the long-term competitive point of view, the establishment of brand marketing is the essential means of long-term development company.

  从长期竞争来看，建立品牌营销是企业长期发展的必要途径。

• So far as I know ours is the only language in which it has been found necessary to give name to the piece of prose.

  据我所知，只有我们的语言才让人感到有必要对这类散文起个名字。

• A systematic review should be the cornerstone of every aspect of a guideline for which a recommendation is required.

  有系统的审查应的基石，各个方面的指导方针，其中一项建议是必要的。

• It was said as a joke, but if the man had seen the evil look on Fagin's face, he might have thought the warning was a necessary one.

  这好像是个玩笑，可假如那人看到了费金脸上邪恶的表情，他会认为这种警告是必要的。

• The doctor said that there was no need to medicate my pain, that it was just a hematoma and that the pain would go away by itself.

  医生说没有必要用药物止痛，那只是个血肿罢了，疼痛会渐渐自行消失。