towboat

n.

拖船；拖轮；

1. For example, permits could be issued to travel through locks at specified times, and those permits could be traded among towboat captains.
   比如，可以通过许可证的发放将船闸通行限定在指定时间内，而且许可证也可以在拖船船长之间进行交易。

An Analysis of Towboat Delays
Submerged barge and towboat
Development Trend on Towboat Running in Oil Dock
On the River Towboat with the Gradually Varying Pitch Propeller
Fish Entrainment Rates through Towboat Propellers in the Upper Mississippi and Illinois Rivers
Entrainment of shovelnose sturgeon by towboat navigation in the Upper Mississippi River
U.S. TOWBOAT CHRIS COLLISION WITH THE JUDGE WILLIAM SEEBER BRIDGE, NEW ORLEANS, LOUISIANA, MAY 28, 1993: HIGHWAY-MARINE ACCIDENT REP...
TEST OF THE OPTIMUM ROUTING AND SERVICE FOR THE OPERATION OF OCEAN TOWBOAT IN WINTER SEASON
Measurements of NOx Emissions and In-Service Duty Cycle from a Towboat Operating on the Inland River System
Miranda, L.E., and K.J. Killgore. 2013. Entrainment of shovelnose sturgeon by towboat navigation in the Upper Mississippi River. Jou...