中国大学MOOC: For the direct flight, passengers only need to check in once directly from place A to place B.
举一反三
- passengers only need to check in once directly from place A to their destination is called ___
- 中国大学MOOC: 5. Airport is a place used for passengers’__________.
- 中国大学MOOC: Passengers can’t get the information of flight delay from _______.
- 中国大学MOOC: He moves from place to place where he could find _______ jobs.
- 中国大学MOOC: In ancient times the mails were relayed from one place to______.