manifestation

发烧是流感的常见表现之一。

Fever is a common ___manifestation of the flu.

她的微笑是内心幸福最真实的体现。

Her smile is the purest ___manifestation of inner happiness.

她脸上的笑容是内心幸福的最真实表现。

The smile on her face was a true ___manifestation of inner happiness.