随着用头碰撞，这些通讯兵发出短暂的“尖叫”声，聂说。
Along with the headbutt, the signaller makes a brief "piping" sound, says Nieh.
“现在我们知道它是在传达讯息：‘别招募成员去往那个地点，它是危险的’，”聂说。
"Now we know it conveys the message: 'Don't recruit for that spot, it's dangerous'," says Nieh.
“这是一个野心勃勃的计划，但我认为我们能做到，”伯聂乌斯基说。
"It is an aggressive schedule, but I do think we can make it," Bieniawski says.
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