Depending only on formal thinking, Euclid formed system through figure proof, firstly applied the fifth postulate in the 29th proposition.

欧几里德仅仅依靠形式思维，通过图形佐证形成体系，在第29个命题中首先运用第五公设。

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After two weeks, removal rate of the system to COD and ammonium achieved separately 97.2% and 96.4%, and the membrane-formed system had stronger ability to resist hydraulic and pollution loading.

运行到两周以后对COD和氨氮的去除率分别达到97.2%、96.4%，且挂膜后的系统有较强的耐水力负荷和污染负荷的能力。

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The Greeks developed this system and formed the letters of the Greek alphabet.

希腊人发展了这个系统，形成了希腊字母表的字母。

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A month later a Lebanese power-sharing system was formed to divide power under religious lines.

VOA: standard.2009.09.24

The country formed a parliamentary system of government and elections were held.

VOA: standard.2009.08.27

It's by studying the dynamics of the icebergs in the rings that scientists hope to understand how the whole Solar System formed.

BBC: Saturn's beauty and power

Abell says these fragments may also provide planetary scientists with new windows onto details about how the solar system formed and how life evolved here on Earth.

FORBES: NASA Eager To Analyze Russian Meteor Fragments

So when we collect comet dust, we're actually collecting some stardust that was, you know, four and a half billion years old and was here when the solar system formed.

NPR: Stardust Set to Deliver Comet Samples