溫度真的太高
這一支講的是真的溫度：引擎、機器、食物、身體，熱到不能正常運作。
verb · B2
To become too hot to work properly or safely, or to make something too hot. Used about engines, machines and rooms, about food being cooked, and about people's bodies.
過熱
核心畫面
Picture a line that heat is fine below and dangerous above. Warming something up is useful all the way to that line: the engine runs, the sauce , the body works harder. Cross it and the very same heat starts to break things. Over- in this word is not simply a lot; it marks the moment the line is crossed, which is why the word almost always arrives as a problem or a warning rather than as a description of temperature.
overheat 可以想成一條線：線以下，熱是有用的；線以上，熱開始壞事。加熱到那條線之前都沒問題，引擎跑得動、醬汁…更多收起
overheat 可以想成一條線：線以下，熱是有用的；線以上，熱開始壞事。加熱到那條線之前都沒問題，引擎跑得動、醬汁變濃、身體撐得住。一越過那條線，同樣的熱就開始把東西弄壞。這個字裡的 over- 不只是「很多」，而是「越過了那條線」。所以它幾乎都是壞消息，很少只是在講溫度高。From the word’s history
The source records overheat from Middle English overheten, analysed on the surface as over- plus heat, which is exactly the picture of heat taken past its limit.
本批評證記錄 overheat 來自中古英文 overheten，構詞上就是 over-（過頭）加上 heat（熱），正好對應「熱越過那條線」的畫面。
Wiktionary entry for overheat supplied in this packet (kaikki:3f6f69a190036ae4:1368074859:18886), etymology_text: From Middle English overheten ... By surface analysis, over- + heat.
Two branches
經濟成長越線
把同一條線搬到經濟上：成長像熱，過了線就開始造成傷害。
verb · C1
If an economy or a market overheats, it grows too fast, and this pushes up prices, wages and interest rates; something such as cheap borrowing can also overheat it.
（經濟）過熱