n. 冰上滑艇, 碎冰船

iceboat \iceboat\ n.
1. A ship with a reinforced bow to break up ice and keep
channels open for navigation; an icebreaker.

Syn: icebreaker.
[WordNet 1.5]

2. a sailing craft with runners and a cross-shaped frame;
suitable for traveling over ice; it is usually propelled
by a sail, and sometimes by an engine-powered propeller.

Syn: ice yacht.
[WordNet 1.5]