birchbark ['bɜ:tʃbɑ:k]

例句:

• The lissome birchbark canoe seemed to be a fish, so easily did it cut through the rolling black waves and ranks of ice.
  轻盈的桦皮舟像一条大鱼，在滚滚的黑色波涛和冰排中间飞一般地前进。
  
• They smiled at him and directed him to board a birchbark canoe.
  他们对她笑着,领着他登上了一只桦皮舟.