In the case of karaoke though what is empty isn't the hand but the vocal track.
但是，在卡拉ok一词中，空荡荡的不是双手，而是声轨。
"These results support our prediction that women use vocal characteristics to track the threat potential of their competitors," said David Puts, the anthropologist who led the study.
“研究结果证明了我们的预测是对的，即女性会通过声音特征来判断自己竞争对手的威胁程度，”该项研究领导人、人类学家大卫-朴茨说道。
I went on to graduate from Carnegie Mellon University with a degree in vocal performance. And it felt like I was back on track.
之后我继续攻读卡内基·梅隆大学声乐表演系，仿佛我又开始一步步走上正轨。
Meerkats rely heavily on vocal communication to co-ordinate activities and keep track of any changes in their environment.
猫鼬很大程度上依赖于声音沟通，来协调活动和跟踪他们生存环境的变化。
Meerkats rely heavily on vocal communication to co-ordinate activities and keep track of any changes in their environment.
猫鼬很大程度上依赖于声音沟通，来协调活动和跟踪他们生存环境的变化。
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