When researchers tracked the effects of the moose and wolves on the balsam firs, they actually found that the number of wolves in the area affected the growth of the firs.

• 当研究者们进一步追踪麋鹿和狼群对胶冷杉的影响，他们发现实际上这个区域内狼群的数量才是影响胶冷杉生长的真正原因。