频繁头痛可能是压力的表现之一。

Frequent headaches can be one of the ___manifestations of stress.

这些艺术展览是年轻人对环保理念的表达。

These art exhibitions are ___manifestations of young people's environmental awareness.

据说这座老庙里经常出现幽灵的显现。

People say there are frequent ghostly ___manifestations in this ancient temple.