With a control group, the researchers made no attempt to copy behaviors; instead, they adopted a neutral tone and body language.
在另一组学生中，研究人员不模仿动作，而是采取中性的语调和肢体语言。
2
About tone in five people carry a single copy of the variant, known as KL-VS, that boosts levels of the protein and is associated with longer lifespan and improved heart and kidney function.