To preheat is to heat an oven (or sometimes a pan or grill) to the right temperature before you put the food in. Recipes say “Preheat the oven to 180°C” because many cakes and breads need that heat already waiting; if you put them in a cold oven, they cook in a different way.

To preheat preheat（預熱）is to heat an oven (or sometimes a pan or grill) to the right temperature就是把烤箱（有時候是鍋子或烤架）先加熱到適當的溫度 before you put the food in再把食物放進去 Recipes say 'Preheat the oven to 180°C'食譜會寫「Preheat the oven to 180°C（把烤箱預熱到180度）」 because many cakes and breads need that heat already waiting因為很多蛋糕和麵包需要那個溫度已經準備好；if you put them in a cold oven如果把它們放進冷的烤箱 they cook in a different way烤出來的結果會不一樣

It is an ordinary kitchen verb, used in cookbooks everywhere.

It is an ordinary kitchen verb這是一個很普通的廚房動詞 used in cookbooks everywhere到處的食譜書都會用

You can also meet a noun, a preheat, for that first heating stage, but the verb is what students need. Though actually, you preheat the oven, not the cake: the food is what you cook after the heat is ready.

You can also meet a noun你也會遇到一個名詞用法 a preheat, for that first heating stage就是 a preheat，指最初那個加熱的階段 but the verb is what students need但學生需要的是動詞這個用法 Though actually不過其實 you preheat the oven, not the cake你 preheat 的是烤箱，不是蛋糕：the food is what you cook after the heat is ready食物是等溫度準備好之後才拿來煮的東西

People stretch it a little (“preheat the pan with a bit of oil”), which is the same idea — get the heat ready first. It is not a fancy or scientific word; it is just the cook’s “do this before.”

People stretch it a little人們也會把它用得寬鬆一點 ('preheat the pan with a bit of oil')像「preheat the pan with a bit of oil（把鍋子加一點油先預熱）」 which is the same idea但意思是一樣的 — get the heat ready first先把溫度準備好 It is not a fancy or scientific word這不是一個很花俏或科學的詞；it is just the cook's 'do this before.'它就是廚房裡「先做這件事」的說法