Number + 套 + Noun
The character 套 (tào) is a measure word meaning 'a set,' 'a suite,' or 'a series' of related items. It is used to count groups of things that belong together as a complete unit. For example, 一套方法 means 'a set of methods' and 一套房间 means 'a suite of rooms.'
他在网上买了一套西装,质量很好。
tā zài wǎng shàng mǎi le yī tào xīzhuāng, zhìliàng hěn hǎo.
He bought a suit online, and the quality is very good.
这套教材适合初学者使用。
zhè tào jiàocái shìhé chūxuézhě shǐyòng.
This set of textbooks is suitable for beginners.
她最近搬进了一套新公寓。
tā zuìjìn bānjìn le yī tào xīn gōngyù.
She recently moved into a new apartment.