เสียงที่ใช้ร่วมกัน

Welcome to EasyLearning Class… [Warm tone… slow, confident entry] In our last class, we talked about chemical symbols… how elements are represented using letters. [Pause] Today… we take it a step further. [Emphasis… lean in] We are now learning how those symbols come together… to form something meaningful. [Pause] We are talking about Chemical Formulae. [Calm teaching tone] Now… let’s think about this together… [Curious tone] If symbols are like letters of the alphabet… What do letters form? [Pa