CLEAN : Russia China reach $60 bn oil supply deal

The video discusses the speaker's time in China compared to Russia, followed by greetings to friends and students. It then covers the preparation of large-scale, unlimited contracts with Russian oil companies, highlighting the significant supply of oil to China, which is valued at $6 billion.

在中國和俄羅斯的供應中，哪一個國家的供應時間更長？

文本中提到的合約是什麼類型的合約？