The yolk is the round yellow part in the middle of an egg. The clear part around it turns white when you cook it, and that part is called the white; the yellow ball in the centre is the yolk.

The yolk蛋黃 is the round yellow part in the middle of an egg就是蛋中間圓圓的黃色部分。The clear part around it周圍那層透明的部分 turns white when you cook it煮熟後會變白，and而 that部分 part is called the white叫做蛋白；the yellow ball in the centre中間那顆黃色的球 is the yolk就是蛋黃。

In a raw egg the yolk is soft and will break if you touch it, and it runs out thick and orange-yellow. In a hard-boiled egg it is dry and crumbly.

In a raw egg在生蛋裡，the yolk蛋黃 is soft and will break if you touch it是軟的，一碰就會破，and而 it it runs out thick and orange-yellow流出來時濃稠、呈橙黃色。In a hard-boiled egg在水煮全熟的蛋裡，it它 is dry and crumbly是乾乾鬆鬆的。

People talk about yolks a lot in cooking, because many recipes want only one part of the egg: 'separate the eggs' means take the yolk out and keep the white apart. Cooks say things like a runny yolk (still soft, it runs when you cut it) or an egg yolk (the full name, very common, even though yolk alone already means the same).

People人們 talk about yolks a lot in cooking在烹飪時常常會提到蛋黃，because因為 many recipes很多食譜 want only one part of the egg只想用蛋的其中一部分：'separate the eggs'「separate the eggs」 means take the yolk out and keep the white apart意思是把蛋黃取出來、蛋白分開放。Cooks廚師 say things like a runny yolk會說像 a runny yolk這樣的話（still soft, it runs when you cut it還是軟的，切下去會流出來）or或 an egg yolk an egg yolk（the full name, very common完整說法，很常用，even though yolk alone already means the same雖然單講 yolk 意思就一樣了）。

In biology, the yolk is the food store for the baby bird growing inside the egg — that is what it is really for, and you will meet the word this way in science texts too, sometimes about fish and other animals, not only chickens.

In biology在生物學上，the yolk蛋黃 is the food store for the baby bird growing inside the egg是給蛋裡正在發育的小鳥用的食物儲存庫——that就是它真正的作用 is what it is really for，and而 you你 will meet the word this way in science texts too在科學文章裡也會看到這種用法，sometimes about fish and other animals有時候講的是魚或其他動物，not only chickens不只是雞。

A few English speakers also use yolk in a loose way for any yellow centre of something, but that is rare and playful, not standard. The word is a countable noun: one yolk, two yolks. It is not usually a verb.

A few English speakers少數說英語的人 also use yolk in a loose way也會鬆散地用 yolk for any yellow centre of something來指任何東西中間黃色的部分，but但 that這種用法 is rare and playful很少見也帶點玩笑性質，not standard不是標準用法。The word這個字 is a countable noun是可數名詞：one yolk, two yolks像 one yolk、two yolks。It它 is not usually a verb通常不當動詞用。