Number + 台 + Noun (machine/device)
The measure word 台 (tái) is used for counting machines, devices, and large equipment such as computers, televisions, and vehicles. It is placed between a number and the noun it quantifies. It is one of the most common measure words for mechanical or electronic equipment.
我刚买了一台新电脑,速度快多了。
wǒ gāng mǎi le yī tái xīn diànnǎo, sùdù kuài duō le.
I just bought a new computer; it's much faster.
家里有两台空调,夏天也不怕热。
jiā lǐ yǒu liǎng tái kōngtiáo, xiàtiān yě bú pà rè.
There are two air conditioners at home, so we're not afraid of the heat in summer.
公司新进了三台打印机。
gōngsī xīn jìn le sān tái dǎyìnjī.
The company just brought in three new printers.