There are many theories about the beginning of drama in ancient Greece. The one most widely accepted today is based on the assumption that drama evolved from ritual.

关于古希腊戏剧的起源存在着多种理论，其中一个最普遍为人接受的理论假设认为戏剧从仪式演化而来。

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Many of these collaboration tools are based on open source software and are widely distributed.

这些协作工具中许多都基于开源软件，并且分布广泛。

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First, it has been widely reported that the Bear Stearns hedge funds lost money on highly rated derivative securities based on subprime mortgages.

首先，外界广泛报道，贝尔斯登旗下的对冲基金是在基于次级抵押贷款、评级较高的金融衍生证券上出现的亏损。

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Against the initial instincts of his foreign affairs spokesman, Sir Menzies Campbell, and Alan Beith, the senior Lib Dem who sits on the Intelligence and Security Committee, Mr Kennedy demanded as the price of his co-operation a widely based inquiry that would examine both the political decision-making and the war's legality.

ECONOMIST: Intelligence

Investors are dumping the currency because the Canadian economy is widely perceived as commodity-based and export-oriented at a time when commodity prices are depressed and export markets are sluggish.

ECONOMIST: The Canadian dollar

Little or no evidence exists that supports the effectiveness of fear-based warnings for a product that carries widely-known risks.

FORBES: Further Down the Slippery Slope: The EU's Tobacco Package Property Seizure