For instance, in quadrupeds the ears stand out freely from the head and are set to all appearance above the eyes. Not that they are in reality above the eyes; but they seem to be so, because the animal does not stand
erect1, but has its head hung
downwards2. This being the usual attitude of the animal when in motion, it is of advantage that its ears shall be high up and movable; for by turning themselves about they can the better take in sounds from every quarter.
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1
erect
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| n./v.树立，建立，使竖立；adj.直立的，垂直的 |
参考例句： |
- She held her head erect and her back straight.她昂着头，把背挺得笔直。
- Soldiers are trained to stand erect.士兵们训练站得笔直。
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2
downwards
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| adj./adv.向下的（地），下行的（地） |
参考例句： |
- He lay face downwards on his bed.他脸向下伏在床上。
- As the river flows downwards,it widens.这条河愈到下游愈宽。
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