往返運行; 往返旅行; 往返流動to shuttle between A and B 往返於A和B之間to shuttle to and fro or back and forth 往返穿梭
vt.
往返運送to shuttle sb./sth. backwards and forwards or to and fro between A and B 在A和B之間往返運送某人/某物to shuttle sb./sth. from one place to another 將某人/某物從一地運往另一地