Examples
我妹妹比我小三岁。 我妹妹比我小三歲
wǒ mèi mèi bǐ wǒ xiǎo sān suì
My sister is three years younger than me.
坐火车比坐飞机便宜。 坐火車比坐飛機便宜
zuò huǒ chē bǐ zuò fēi jī pián yi
The train is cheaper than flying.
今天比昨天冷多了。 今天比昨天冷多了
jīn tiān bǐ zuó tiān lěng duō liǎo
Today is much colder than yesterday.