He yakked on endlessly about his wife.

于他妻子, 他喋喋不休地说个没完。

The jokes get yaks.

那笑话引人发笑。

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.

只因牦栖息在偏远地区，养畜牦民又甚少与外界接触，知识水平都普遍低下，以致牦经济价值不及羊和乳般广为人知。