一句英文翻譯，additional patterns,

Question

If the casting is to be hollow, as in the case of pipe fittings, additional patterns, referred to as cores, are used to form these cavities.
additional patterns, referred to as cores的意思是：「patterns就是 cores」是不是這個意思？
CORE的定義：Cores are forms, usually made of sand, which are placed into a mold cavity to form the interior surfaces of castings. Thus the void space between the core and mold-cavity surface is what eventually becomes the casting.

Answer 1

版主您好:

If the casting is to be hollow, as in the case of pipe fittings, additional patterns, referred to as cores, are used to form these cavities.
如果要鑄造空心物件, 譬如管路配件, 就用另外的模具, 稱為"模芯(?)", 來形成其中空部分.