这个神话故事里描述了一只三头犬守卫着冥界的大门。

The myth tells of a ___three-headed dog guarding the gates of the underworld.

这个项目的管理变成了三头怪，每个部门都有自己的领导。

The project's management turned into a ___three-headed beast, with each department having its own leader.