森林里回荡着生活在黑暗中的夜行尖叫者的叫声。

The forest echoed with the cries of nocturnal ___shriekers that lived in the dark.

游乐园的过山车配备了尖啸器，可以在高速下坡时发出刺耳的声音。

The roller coaster at the amusement park is equipped with ___shriekers that produce loud screeching sounds during steep drops.