Translation of "Human's" in Chinese

A dog's sense of smell is much keener than a human's.

狗的嗅覺比人類敏銳得多。

A giraffe's heart is nearly thirty times heavier than a human's.

长颈鹿的心脏几乎比人的心脏重三十倍。

- Dog is man's best friend.
- The dog is the human's best friend.

狗是人最好的朋友。