In this meaning, furred is not about animal hair. It is what happens when a surface slowly gets a soft, unwanted crust.

In this meaning在這個意思裡， furred is not about animal hairfurred講的不是動物的毛。It is what happens它指的是 when a surface slowly gets a soft, unwanted crust一個表面慢慢長出一層不想要的軟垢。

A kettle furs up with limescale from hard water. Pipes can fur.

A kettle furs up水壺會結出一層垢 with limescale from hard water是硬水裡的水垢。Pipes can fur水管也會結垢。

A tongue looks furred when you are ill — a pale coating. Doctors used to talk about furred arteries, a fatty lining inside.

A tongue looks furred舌頭看起來furred（有舌苔） when you are ill在你生病的時候— a pale coating一層淡淡的覆蓋物。Doctors used to talk about furred arteries醫生以前會講furred arteries（血管內壁結垢）， a fatty lining inside裡面有一層脂肪內壁。

British English uses this a lot for kettles; you also hear furred up. The picture is “as if a thin fur had grown on it,” which is how the meaning grew from fur, but the feeling now is dirt or deposit, not a nice coat.

British English uses this a lot for kettles英式英文很常拿這個字講水壺； you also hear furred up你也會聽到furred up。The picture is "as if a thin fur had grown on it,"畫面就像是「上面長出了一層薄薄的毛」， which is how the meaning grew from fur這也是這個意思從fur（毛）長出來的方式， but the feeling now is dirt or deposit但現在的感覺是髒污或沉積物， not a nice coat不是好看的一層皮毛。

Though actually, the same spelling still means “covered in fur” in other sentences (a furred hood). Here we are only talking about that unwanted layer.

Though actually不過其實， the same spelling still means "covered in fur" in other sentences同樣的拼法在別的句子裡還是可以指「覆蓋著毛皮」 (a furred hood)（像a furred hood，有毛皮滾邊的兜帽）。Here we are only talking about這裡我們只講的是 that unwanted layer那層不想要的垢。