Mars’s rapid formation might help explain why it is so small –the runt of the planetary litter among inner worlds in our solar system –say the study’s co-authors.

这次研究的合作者说，火星的迅速形成可以解释为什么它的体积那么小的原因，可以说它是我们太阳系内的侏儒行星了。

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Mulbry has already begun another study to see whether fertilizer made from chicken and poultry litter can also benefit from the algae cleanup system.

马布里现在已经开始进行更加深入的研究了，他在观察那些利用鸡和其他家禽粪便制造的肥料是否也能通过海藻净化系统提高肥力。

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These reactions may occur in the water body on the surfaces of plants. within the litter accumulation at the wetland surface and on the bottom or within the root zone of the system.

这些作用发生在水体中、植物表面、湿地表面和底部的垃圾积累物中，或发生在根区系统而使污染物得以去除。

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If subway rats have grown up eating from the trash bags and track litter of the subway system, those foods will prove most enticing.

WSJ: MTA Sets New Tactic in Rat War