medium-sized fir of northeastern North America; leaves smell of balsam when crushed; much used for pulpwood and Christmas trees
双语例句
用作名词 (n.)
The narrow rings appeared only after wolf populations decreased, allowing a greater number of moose to survive and eat more balsam firs. 那些比较小的年轮只出现在狼群数目下降之后，允许一个比较大数目的驼鹿去生存和吃更多的香脂冷杉。
