三头的英文：
triceps

It was named after the three-headed watchdog in classical Greek mythology that guards the gates to hades.
其命名是根据希腊神话中守卫冥王大门的长有三头的看门狗做的。

Three heads and two faces
三头二面

Three bulls fed in a field together in the greatest peace and amity.
三头公牛和睦地一起在地里吃草。

Cerberus,the watchdog of Hades.
地狱之犬三头狗，冥府的看门狗

Threepeaters shoot peas in three lanes.
三头豌豆每次向三个方向各射出一颗豌豆。

A large three - headed muscle running along the back of the upper arm and serving to extend the forearm.
肱三头肌位于上臂背面的大三头肌，用于伸展前臂

It is impossible to retaliate against the vicious attack of a three-headed Cerberus.
在地狱三头犬的恶毒攻击下，根本不可能反击。（狗曰：为什么说我恶毒啊？我其实是很善良的，我是人类最忠实的朋友啊！