One step in its formation on Earth involves microorganisms; they actually speed up the formation of jarosite dramatically.

在地球上形成黄钾铁矾的其中一个步骤涉及到微生物；实际上，微生物能大幅加快黄钾铁矾的形成。

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Awareness in combat training can speed up the formation of sports skills.

格斗训练中的意识作用，能加速运动技能的形成。

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However in group dance the changes in movements formation position rhythm and speed must rely on the cue of music.

但在集体舞蹈中，动作的更换，队形和地位的变化，节奏强弱，速度快慢，都是离不开音乐提示的。

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This time,scientists hope to learn more about the formation, wind speed and shape of tornadoes.

VOA: special.2009.06.09

We moved in caravan formation and at the speed of camels, taking two days to drive the 250 miles from London to the west coast of Wales, pottering along in a pair of Morris Travellers.

NPR: Excerpt: 'The Importance of Music to Girls'

The efficiency of trans-European rail travel will be further boosted following the formation of Railteam, an alliance of high-speed rail operators across western Europe.

CNN: The high-speed rail revolution