熊科动物: polar bear, giant panda, black bear, brown bear, Asiaticblack bear, moon bear, sloth bear, sun bear, Andean bear 熊的食物: grass,insect,fish,berry,garbage, bamboo, seal,walrus, termite, ant, fruit, palm, corn 熊的身体部位: head,bone,muscle,chest,hair,eye,claw,tooth,tail put on weight 体重增加 give birth to 生孩子 can'twait to do 迫不及待地做 refer to...as... 把......称作...... team up with 与.....合作 play a role in...在.....·起作用 “must have done”表示对过去的猜测，例如: That person musthave been pretty hungry, because bears can eat a lot. 部分否定句，例如: Not all bears hibernate. while 引导的并列句，例如: But giant pandas are bears,while redpandas are not. “be likely to do”句型，例如: A bear is likely to lose interest andwalk away.