The dual meaning of `特效` highlights two major areas of focus in modern China: global entertainment and public health. On one hand, with China's booming film industry, the term `特效` is everywhere. It's a key selling point for domestic blockbusters (`国产大片`) trying to compete with Hollywood productions. Discussions among friends about the latest Marvel movie or a new fantasy TV series will inevitably involve critiquing the `特效`. On the other hand, the meaning of “special efficacy” taps into the deep-seated cultural importance of health and medicine. The search for a `特效药 (tèxiàoyào)`, or “wonder drug,” is a powerful concept, representing hope and the promise of scientific advancement to cure serious illnesses. A useful comparison to Western culture is the English term “special effects.” In English, this phrase is almost exclusively confined to the world of film and entertainment. We would never say, “This new cancer drug has great special effects.” We would say it's “highly effective” or “has a high efficacy rate.” The Chinese term `特效` elegantly bridges these two concepts, using the idea of a “special and notable result” to apply to both the visual spectacle of a movie and the life-saving power of a medicine.
`特效` is used in both formal and informal contexts, but its meaning is entirely dependent on the situation.