Coolant is the liquid — or, in some machines, the gas — that carries heat away so an engine or other machine does not get too hot. In a car it runs through the engine and into the radiator, picks up the heat, and dumps it into the air.

Coolant冷卻液 is是 the liquid液體 — or, in some machines或在某些機器裡是, the gas氣體 — that carries heat away用來把熱帶走 so讓 an engine or other machine does not get too hot引擎或其他機器不會過熱。In a car在車子裡 it它 runs through the engine and into the radiator會流過引擎、進到水箱, picks up the heat把熱吸走, and再 dumps it into the air排到空氣中。

Mechanics say “coolant”; everyday drivers often say “the water in the radiator,” though actually it is not just water. The same bottle is often called antifreeze, because it also stops the liquid freezing in winter — cooling and not-freezing are two jobs, and one mixture usually does both.

Mechanics say "coolant"修車師傅會說「coolant」; everyday drivers often say "the water in the radiator,"一般開車的人常說「水箱裡的水」though actually不過其實 it is not just water它不只是水。The same bottle同一瓶東西 is often called antifreeze也常被叫做antifreeze（不凍劑）, because因為 it also stops the liquid freezing in winter它在冬天也能防止液體結凍 — cooling and not-freezing are two jobs散熱和防凍是兩件工作, and而 one mixture usually does both通常一種混合液可以同時做到。

You will hear the word in garages, factories, and computer labs (big computers need coolant too). It is a practical, technical word, not slang and not posh.

You你 will hear the word會聽到這個字 in garages, factories, and computer labs在修車廠、工廠，還有電腦實驗室裡 (big computers need coolant too)（大型電腦也需要冷卻液）。It它 is a practical, technical word是一個實用的技術詞彙, not不是 slang俚語, and也 not posh不是文謅謅的用字。

If the coolant is low or leaking, the engine can overheat; that is why the warning light matters.

If the coolant is low or leaking如果冷卻液不夠或在漏, the engine can overheat引擎就可能過熱; that is why這就是為什麼 the warning light matters警示燈很重要。