crepuscular

夕阳西下时，森林沐浴在暮光之中。

The forest was bathed in a ___crepuscular light as the sun set.

萤火虫通常在晨昏时分活动，这是典型的暮光性生物特征。

Fireflies are typically ___crepuscular, appearing most active at dawn and dusk.