Number + 副 + Noun
The measure word 副 (fù) is used to count pairs or sets of things, such as 一副眼镜 (a pair of glasses), as well as facial expressions or attitudes, such as 一副样子 (an appearance/manner). It is a versatile classifier that covers both physical pairs and abstract demeanors. Context determines which meaning applies.
她戴着一副墨镜,看起来很酷。
tā dài zhe yī fù mòjìng, kàn qǐlái hěn kù.
She was wearing a pair of sunglasses and looked very cool.
他一脸愁容,总是一副心事重重的样子。
tā yī liǎn chóuróng, zǒngshì yī fù xīnshì zhòngzhòng de yàngzi.
He had a worried look on his face, always appearing to be weighed down by concerns.
我需要买一副新的手套。
wǒ xūyào mǎi yī fù xīn de shǒutào.
I need to buy a new pair of gloves.