年纪更大、经验更丰富的祖母更善于通过其他大象的叫声来判断它们是陌生人还是朋友。
Older, more experienced grandmothers were better at telling whether other elephants were strangers or friends just by their calls.
大象的叫声是一种咆哮声，在森林中回响，或者穿越草地。
An elephant's call is a trumpeting sound that echoes through the forest or across the grasslands.
普尔还表示，米爱卡这个象群中的其它成员也被人们发现能够发出类似的声音，而这种声音和以前曾记录在案的任何一种大象的叫声都明显不同。
Poole said others in Mlaika's group have been heard to make a similar noise, which is quite different from any call previously recorded in elephants.
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