中国大学MOOC: Jet lag often involves transnational travel by air.
举一反三
- 中国大学MOOC: For blue-collar workers, their work often involves in ___________
- 中国大学MOOC: _______ is not the necessary travel document when you go abroad by air.
- 中国大学MOOC: You can take the life vest away if you travel by air.
- 中国大学MOOC: Airport VIP service refers to _______ and ________ mainly given to the governmental leaders or CIPs to travel by air.
- Travel in the air.