Picture a clock running only while your face is actually in front of someone else. On the phone it stops. In an email it never starts. It runs when the two of you are in the same room and one can see the other. Face time is that stretch of the clock, counted and valued as an amount.
可以想成有一個碼表，只有當你的臉真的出現在別人眼前時才會走。講電話的時候它停著。寫 email 的時候它根本沒開始。只有你們在同一個空間、對方看得到你，它才在走。face time 可以想成碼表上走掉的那一段，被人拿來算、拿來比。
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