Butt tests suggest they also notice the more subtle aspects of human communication - the emotional tone, intonation and volume changes that influence the meaning of language.

不过试验表示，他们也发现了人类交流上一些微妙的方面——情绪基调、声调和音量会对语言的意思产生影响。

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But although he discovered the cells in mouse embryos, human embryos have them too, and that is leading to trouble as the desires of researchers butt up against the fears of ethicists.

ECONOMIST: The 2007 Nobel science prizes