袋熊拉的便便為什么是方形的

河南 谷戰(zhàn)峰

袋熊是地球上唯一一種拉方形糞便的動物。長期以來，這一直困擾著動物研究者們。 現在，研究人員說，他們已經發(fā)現了其中的原因。

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1 Wombats are the only creature on the earth that poops cubes. To animal experts, they have been a mystery for a very long time. Now, researchers say they have uncovered how the wombat creates their unusually-shaped excrement（糞便）.

2 Researchers at Georgia Institute of Technology first started studying the wombat's ability to poop cubes back in 2018. They compared their intestines （腸） to those of pigs. They inserted a balloon into the animals'digestive tracts to see how they stretched to fit the balloon and found regions of varied thickness and stiffness.

3 Scientists then created a 2D mathematical model to copy how these intestine regions contract and expand with the rhythms of digestion, shaping the poop into its cuboid shape. Softer intestinal regions squeeze slowly and mold （塑造） the final corners of the cube over multiple days. Interestingly,in most mammals, the contractions （收縮） of intestinal muscles occur in all directions, but in wombats, the grooved （有溝的；有槽的） tissue and irregular contractions shape the poop differently.

4 While this research may seem completely meaningless, or just meant to satisfy human curiosity, the scientists involved in the study say that these new findings could have a big impact on human digestive health research and manufacturing technology. It would be a cool method to apply to the manufacturing process, how to make a cube with soft tissue instead of just molding it.

5 Now that the mystery of how wombats produce cuboid poop seems to have been solved, that only leaves the “why”. Scientists have some theories about this as well. One states that because wombats pick up their poop and pile it as a way of communicating between them, the cuboid shape helps them build higher poop towers.

6 Another theory claims that because wombats tend to use their poop to mark their controlled land on rocks and logs, the cuboid shape of the excrement ensures that it won't simply roll off.

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While this research may seem completely meaningless, or just meant to satisfy human curiosity,the scientists involved in the study say that these new findings could have a big impact on human digestive health research and manufacturing technology. 盡管這項研究似乎毫無意義， 或者只是為了滿足人們的好奇心， 但參與研究的科學家們說這些新的發(fā)現可能會對人類消化健康的研究和制造技術有很大的影響。

【點石成金】句中While引導的是一個讓步狀語從句，意為“盡管”；the scientists involved...manufacturing technology為主句部分。 involved in the study相當于who were involved in the study，為過去分詞短語作后置定語；that引導的是一個賓語從句。