Documentary looks at China's close links with Cambodia

When late Cambodian king Norodom Sihanouk's late son Norodom Naradipo studied at Beijing No 25 Middle School, he was curious about how ancient Chinese referred to his motherland.

After Niu Chongyang, his history teacher, told him it was Zhen La (Khmer) in Mandarin, the boy felt more confused because zhen la can also mean "really spice" in Chinese.

This anecdote alongside dozens of less well-known stories will feature in an upcoming documentary series The Road to Friendship between China and Cambodia (Zhong Jian Youyi Zhi Lu), which will air on CCTV-4, one of China Central Television's Chinese international channels.