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People always have many luggage to carry when they go abroad, some of them bring more than one trunk to go abroad, but
it's not convenient to carry so many luggage. And the trolley in the airport can't go every where, there are some place do not
allow trolley to entry."The one" is a trunk which can combine two trunks together, it use concave and protruding, the latch to
fixed. The user can easy carry the luggage.
Ja,jun Liou Nai,Yun Chang Yu,Ping Chao