互惠共生的另一个例子是在中美洲和南美洲生长的牛角相思树。
Another example of mutualism would be the bull's horn acacia tree, which grows in Central and South America.
相思树，流-年渡，无端又被西风误！
但是研究人员注意到，大象对有一种相思树不感兴趣。
But researchers noticed that one species of acacia was not much bothered by elephants.
应用推荐