A. Enzymes transform complex, recalcitrant aromatic and aliphatic hydrocarbons that are not easily biodegradable to simple fatty acids, thereby accelerating biological cleanup.
2
在那里，他们控制其他生物的数量，将植物种子带往各地，清除地面上衰败和腐烂的物质。
There, they keep other creatures in check, distribute seeds, and clean dead and decaying materials from the ground.
3
长期以来，生物学家们认为雄鹿擦痕不仅可以清除并磨光鹿茸，还可以借此练习发情期时雄鹿之间的角斗。
For a long time biologists believed that male deer used buck rubs not only to clean and polish antlers but also to provide practice for the ensuing male-to-male combat during the rut.
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