两 + Classifier + Noun
两 (liǎng) means "two" and is used specifically when counting or quantifying things with classifiers, as opposed to 二 (èr), which is used in numbers and sequences. It appears before a classifier and noun to indicate a quantity of two. For example, 两个人 means "two people."
桌子上放着两杯咖啡。
zhuōzi shàng fàng zhe liǎng bēi kāfēi.
There are two cups of coffee on the table.
我有两个姐姐,她们都在国外。
wǒ yǒu liǎng gè jiějie, tāmen dōu zài guówài.
I have two older sisters; they are both abroad.
他两年前来过这里。
tā liǎng nián qián lái guo zhèlǐ.
He came here two years ago.