Examples
zhōng guó中国de的rén kǒu人口yǐ jīng已经chāo guò超过le了shí sān十三yì亿。
中国的人口已经超过了十三亿。
The population of China has already exceeded 1.3 billion.
Tom有个十三岁的女儿。
Tom has a 13-year-old daughter.
汤姆十三岁以前读得不好。
Tom couldn't read very well until he was thirteen years old.