thruster
/ˈθrʌstə(r)/noun
1- a person or thing that thrusts, in particular推进者, 尤指：
1.1
- a small rocket engine on a spacecraft, used to make alterations in its flight path or altitude第一级火箭发动机。
1.2
- a secondary jet or propeller on a ship or offshore rig, used for accurate manoeuvring and maintenance of position推进器; 助推器, 推力器。
1.3
- informal a person who is aggressively ambitious〈非正式〉拼命向上爬的人; 积极进取的人。
1.4
- a surfboard or sailboard capable of increased speed and manoeuvrability owing to a more streamlined shape and the provision of one or more additional fins冲浪加速板。