A teacher can usually tell if students are listening by looking at their body language. If students are making eye contact, nodding, or sitting up straight, it shows they are paying attention. On the other hand, if they are playing with their phones or talking to their friends, it's clear they are not really listening.
老師通常可以透過觀察學生的肢體語言來判斷他們是否在聽講。如果學生有眼神接觸、點頭或坐得端正,表示他們正在專心聽講。另一方面,如果他們在玩手機或與朋友交談,就很明顯他們並沒有真正聆聽。