ice guard的用法和樣例：
例句
- Icebreaker Nutcracker now has to break a channel for the convoy of ships to get through the thicker ice.
破冰船必須為船舶編隊開好航道，以通過堅冰區。 - Probably formed on the side of the Finnish icebreaker Tarmo, a feather-edged loaf of ice floats in the Gulf of Finland.
芬蘭灣里漂來一塊羽毛狀的冰塊，它可能是在芬蘭破冰船塔爾莫號的邊上形成的。
