应该用一只行军蚁。
For example, take the army ant, of which around 130 species have been identified in the Americas alone.
用军蚁来作个例子，光光在美国，已被确认了的军蚁种类就有约莫130种。
Any of various dull-colored south american birds that feeding on ants some following army ant swarms.
南美洲各种以蚂蚁为食的深色鸟类，有一些跟着蚂蚁群。
The acacia and its ant army are a textbook example of mutualism between species.
洋槐树和它的蚂蚁亲卫队是物种之间互利共生关系的经典范例。
The acacia and its ant army are a textbook example of mutualism between species.
洋槐树和它的蚂蚁亲卫队是物种之间互利共生关系的经典范例。
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