Yak-38

He yakked on endlessly about his wife.

关于的, 喋喋不休地说个没完。

The jokes get yaks.

那笑话引发笑。

Only because yak is living in remote area and oxherd, with low knowledge,  has less communication with outside world , the yak is less heard and popular as sheep and milk cow.

只因牦牛栖息在偏远地区，养畜牦牛的牧民甚少与外界接触，识水平都普遍低下，以致牦牛的经济价值不及羊和乳牛般广为。