People act and learn together for a rich mixture of reasons.

人们一起做事与学习，原因复杂多样。

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The idle system supplies a very rich mixture to start with.

怠速系统提供很浓的可燃混合气供起动使用。

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In a two-stroke gasoline engine, exhaust gas pollution is especially severe when it burns rich mixture of blended fuel.

二冲程汽油机排气污染严重，尤其是燃烧混合油、浓混合气时有害物排放量大。

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Ford's new solution captures the volatile organic compounds from paint waste and concentrates them into a rich mixture of hydrocarbons.

FORBES: Paint Power

"The guess is that both the water and the dark material, which we think is organic-rich material, were delivered by the same objects impacting Mercury: some mixture of comets and the kinds of asteroids that are rich in organic and volatile material like water ice, " Prof Solomon said.

BBC: Mercury's water ice at north pole finally proven

That mixture is then fed into a fuel reformer that turns it into a hydrogen-rich gas.

FORBES: Paint Power