Every smell we perceive is a complex interaction between molecules and receptors, and understanding this interaction is key to understanding our sensory experiences.

世界就是所有实际情况。

《盐铁论·轻重》茂密的树林下面没有旺盛的青草；在没有平整的地里，长不出好的禾苗。比喻在强大的势力下，弱者会受到压制和侵害。