故事中的女巫拥有变身的能力，可以随意改变外貌。

The witch in the tale has the power of ___shapeshifting and can alter her appearance at will.

优秀的演员需要掌握角色转换的艺术，以适应不同的剧本要求。

Great actors master the art of ___shapeshifting to adapt to various script demands.