科学家们相信，狗能够数数。美国加利福尼亚大学的研究人员说，狗能通过它们的叫声的大小和快慢表达不同的信息。
Scientists are convinced that dogs can count and researchers at the University of California say they try to convey different messages through the pitch and pace of their barks.
科学家们相信，狗能够数数。美国加利福尼亚大学的研究人员说，狗能通过它们的叫声的大小和快慢表达不同的信息。
Scientists are convinced that dogs can count and researchers at the University of California say they try to convey different messages through the pitch and pace of their barks.
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