1. Human beings needed to use tools because they did not have sharp teeth like other meat-eating animals, such as lions and tigers. 人类需要使用工具，因为他们没有像其他食肉动物如狮子和老虎那样锋利的牙齿。
2. The struggle for existence occurs not in such fights, but in the competition for limited feeding areas and for the occupancy of areas free from meat-eating animals. 生存的斗争并不发生在这种争斗中，而是为了争夺有限的摄食区域，以及为了争夺没有食肉动物的领地。
3. Early therapods, the group of dinosaurs that includes all meat-eating species from Velociraptor to Tyrannosaurus rex, gained ground and thrived. 早期的兽脚亚目食肉恐龙，包括从迅猛龙到霸王龙在内的所有肉食物种，抢占了地盘并茁壮成长。
4. The struggle for existence occurs not in fights, but in the competition for limited feeding areas and for the occupancy of areas free from meat-eating animals. 为生存而进行的斗争不是发生在战斗中，而是在争夺有限的觅食区和占用没有肉食动物的区域的竞争中。
5. Quite simply, you can't be a meat-eating environmentalist. 很简单，你不能当吃肉的环保人士。
