Although biologists can easily induce extra limbs to grow on the flank of a tetrapod, this cannot be done in the neck. 雖然生物學家能輕易讓四足動物在側腹長出額外的肢，在頸部卻做不到。
The Pomeranian has sufficient layback of shoulders to carry the neck and head proud and high. 博美的肩膀足夠靠後，使頸部和頭能高高昂起。
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