脸部表情和声音
Facial expressions and voices
以上为机器翻译结果，长、整句建议使用 人工翻译 。
如果这个假设成立的话，那么各种特别的脸部表情和声音就只会在特殊的情境下才能发生，而且在物种群甚至是物种之间都是一致的。
If that were true, particular sorts of facial and vocal expression would occur only in particular contexts, and that this would be consistent across groups and even species.
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