question: air freight:sea freight:transportation
choices.label: A B C D
choices.text: paperback:hardcover:bookbinding cargo ship:passenger ship:cruise ship evening:party:rally test flight:trail flight:aerospace
explanation: "air freight" and "sea freight" are kinds of "transportation", and "air freight" and "sea freight" are both transportation. "paperback" and "hardcover" are a kind of "bookbinding", and "paperback" and "hardcover" are different ways of "bookbinding". "cargo ships" and "passenger ships" are the same maritime means of transportation. "cruise ships" refer to large passenger ships with fixed lines and regular sailings on the ocean, and "cruise ships" are a type of "passenger ships". "evening" belongs to "rally". "test flight" refers to the flight test of the aircraft before the aircraft is put into use. "trial flight" refers to the test voyage of the aircraft or ship, etc. "trial flight" includes "test flight".
relation: air freight sea freight R2.4
relation: paperback hardcover R2.4
relation: cargo ship passenger ship R3.10
relation: passenger ship cruise ship R2.2
relation: evening rally R2.2