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汉语拼音：bì yào tiáo jiàn

如果无甲必无乙，有甲则可能有乙也可能无乙，那么甲就是乙的必要条件。例如，不遵守逻辑规则必然写不出好文章；遵守逻辑规则，则可能写出好文章也可能写不出好文章。因此，遵守逻辑规则就是写出好文章的必要条件。

• Another essential condition for a weak army fighting a strong one is to pick out the enemy's weaker units for attack.

  弱军对于强军作战的再一个必要条件，就是拣弱的打。

• I do not know, but many of the conditions necessary are there and a number of strategists are predicting one.

  我不知道。不过，形成泡沫的必要条件已经满足了不少，许多策略师也预言泡沫将会出现。

• But a look at its severe computational requirements quickly convinces the hopeful engineer how unlikely such a system would be in real life.

  然而，它严格的计算必要条件，很快就让抱有希望的设计者明白了，现实生活中不大可能存在这样一个系统。

• Purchasing a house is one of the few investment vehicles available to Chinese people and is often considered a pre-condition for marriage.

  购房是中国人为数不多的几种投资手段之一，有无自己的住房也是青年人能否成婚的必要条件。

• The Delegation reiterated that it did not think that necessary conditions existed to enter into a debate on amending the WIPO Convention.

  代表团重申，现在不存在就是否修改《WIPO公约》展开辩论的必要条件。

• Yahoo, in its SEC filing earlier this week, said the restructuring was necessary to expedite obtaining an 'essential' regulatory license.

  雅虎本周早些时候在提交给美国证券交易委员会（SEC）的备案文件中说，重组是尽快取得一份“重要”监管许可的必要条件。

• The reason we call it a necessary condition for " " because cadres'new " " may only exist in formal logic.

  之所以称其为“必要条件”，是因为“必要条件”可能只存在于形式逻辑中。

• The only requirements they seem to recognise, however, are glass, steel and concrete for the office buildings.

  然而，似乎它们认识到的唯一必要条件是用于建设办公大楼的玻璃、钢材和水泥。

• Transparency is not just a natural inclination but a necessity, says Mitchell Baker, who chairs the foundation.

  基金会主席MitchellBaker称Mozilla的透明化不仅仅是其自身发展趋向，更是生存的必要条件。