核心畫面

One way to hold this word: EMS is not a word with a picture inside it. It is three letters standing in for a long name, and different fields have each borrowed the same three letters for a different long name. So the letters are an empty shell, and the field you are reading in is what fills them. Ambulances in one paragraph, parcels in the next, factories in a third. The first question is never what does EMS mean, it is what is this text about.