换句话说，他们的玩耍是为了练习生存技能，比如狩猎和战斗中运用的动作。
In other words, they play in order to practice survival skills, like movements used in hunting and fighting.
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。
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.
很难想象还有什么比为一个国家的海岸和农场的生存、人民的健康和经济的稳定而战的更大的战斗了。
It's hard to imagine a bigger fight than one for the survival of a country's coasts and farms, the health of its people, and the stability of its economy.
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