"Another pair" in Engpsh is commonly referred to as "another set of two." The phrase originates from the idea of having multiple sets of similar items, where each set consists of two identical or similar objects.
Examples in Engpsh:
I need to buy another pair of shoes because my old ones are worn out.
She has two pairs of earrings, one for everyday wear and another for special occasions.
Translations in Chinese:
我需要再买一双鞋，因为我的旧鞋穿坏了。
她有两双耳环，一双是平常穿的，另一双是特殊场合用的。