Most of these messages we can only hear by using special microphones. 大部分信号我们只能通过特殊麦克风听到
They not only have a bizarre appearance... 角蝉不仅长相奇特
They only surface for a split second 它们跃出水面的瞬间稍纵即逝
It is only found in Pakistan and nowhere else. 只分布于巴基斯坦
And we only have about 2,000 of them left in the Indus River. 印度河中只剩下约2000只了
Indus river dolphin can only live in freshwater. 印度河豚只能存活于淡水中
Freshwater is not only a resource for humans. 淡水不仅是人类的资源
so the only option is for this rescue team to take her. 因此唯一的选择就是由救援队救走它