the activity of making wool or other cloth into felt (= a thick, soft cloth) by rolling and pressing it and using hot water or a special needle

Felting is one of the oldest forms of textile arts. 制毡是最老的纺织艺术之一。

Needle felting is begun by rolling up a small amount of wool and stabbing it with the needle. 针刺制毡的做法是先揉出一小团羊毛，然后用针反复戳刺。

a process by which something made of wool becomes thick and stiff because the fibres in it stick together

To guard against felting, do not swish your woollen garments around in the water when you handwash them and never rub them. 为防止毡化，当您手洗羊毛衣服时，不要在水中晃动它们，也不要摩擦它们。