Noun:

1. a motorboat with an outboard motor

2. internal-combustion engine that mounts at stern of small boat

Adjective:

1. located away from the midline of a vessel or aircraft;

   "the outboard section of a wing"
   "outboard rigging"
   

externaladj.外来的；外部的；外面的；表面的n.外观；外部；外界事物

on the outside在外侧

outsideadv.在外面n.外面adj.外部的prep.在 ... 外边

outwardadj.向外的；表面的；外部的adv.向外；在外；表面

exteriorn.外部；外表；外景adj.外部的；表面的；对外的；户外的

outboard motorn.舷外马达

outboard motorboat装有船尾马达的汽艇

inboardn.内有马达的船adv.在船内；在舱内；向内侧adj.内侧的；舱内的

1. This boat is equipped with an outboard motor.
   这只船装有舷外发动机。
2. The packing is also susceptible to both inboard and outboard leakage.
   密封环也容易受到内部和外部泄漏的影响。