Since play fighting includes variations in speed and intensity, and quick role reversals involved with self-handicapping.

因为玩耍性打斗包括速度和强度的变化，以及与自我设限有关的角色快速转换。

youdao

The law makes for ironic role reversals.

FORBES: Mortgage-Audit Firm -- Surprise! -- Finds Lots of Errors in Foreclosures

The only thing I'll note of those circumstances is that they lead to encounters of genuine tenderness, humor and complexity, as well as affecting role-reversals in which the child takes care of the parent.

WSJ: Brave | Abraham Lincoln: Vampire Hunter | To Rome With Love | Pixar Plays It Safe | Film Reviews by Joe Morgenstern