what does the polar bear live

北极熊靠什么为生?
live on
1.继续活着; 继续存在
He's ninety, but still he lives on.
他90岁了, 还健在.
These traditions will live on for centuries.
这些传统将世代相传.
The composer's works will always live on.
这位作曲家的作品将永远留在人间.
2.住在…上
I have always wanted to live on an island in the middle of a lake.
我总是想在一座湖心小岛上生活.
3.以…为食; 靠…为生
Most of Asians live on rice.
多数亚洲人以大米为主食.
She still lives on her parents.
她依靠父母生活.
That old man lives on the earnings of his daughter.
那个老人靠他女儿的收入维持生活.
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