一类是已被驯化的“六畜”，即牛、羊、马、猪、狗、鸡，它们是人类为了经济或其它目的而驯养的，占十二种动物的一半。
The first category includes the six kinds of tamed animals such as the ox, goat, horse, pig, dog and rooster, accounting for half of the zodiac animals.
曾经有人尝试将力克驯化成容易驯养的畜力和食物及工业原料来源。
There have been attempts to breed reek for simple, easily-domesticated labor and a source of food and materials.
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