Your perception of something is the way that you think about it or the impression you have of it.
近义词impression
双语例句例： He is interested in how our perceptions of death affect the way we live.
他对我们的死亡观如何影响我们的生活方式感兴趣。
例： There was still a perception among the public that the city was unsafe.
公众中仍有该城不安全的看法。