special effect
noun [ C usually plural ] uk/ˌspeʃ.əl ɪˈfekt/ us/ˌspeʃ.əl ɪˈfekt/
B1 （电影或舞台娱乐表演中的）特技效果
an unusual piece of action in a film, or an entertainment on a stage, created by using particular equipment
The movie's special effects are amazing. 这部电影的特技效果令人惊叹。