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.

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本文介绍了家猪和野猪的特点，以及家猪起源和驯化的考古学发现，并着重综述了家猪驯化的分子生物学证据的研究进展。

At present, there were few molecule biology researches on exercise-preventing and curing hypertension, and the few non-systemic researches investigated some aspects of hypertens.

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