Barks : when confronting another piranha face to face .
发声：当与其他红腹食人鱼面对面遭遇时。
My neighbour 's dog barks at anyone who passes by their front yard .
不管是谁经过我邻居院子前，他们的狗就对路过的人一直叫。
He barks , and of course we have ; why wouldn 't we ?
他大声喊道，我们当然戴了；我们能不戴吗？
The teacher barks out what sounds like commands , while the students remain totally passive throughout .
老师在课堂上的讲授听起来就像是命令，学生在整堂课中则一直处于被动状态。
These findings suggest that the different motivational states of dogs in aggressive , friendly or submissive contexts may result in acoustically different barks .
