Proper use of voice is proclaiming all finds and denoting all forward progress by giving tongue, yet keeping silent when not in contact with scent that can be progressed.
恰当用声是指用声音明示所有发现并指示所有进程，但是在没有接触气味时保持安静。
Proper use of voice is proclaiming all finds and denoting all forward progress by giving tongue, yet keeping silent when not in contact with scent that can be progressed.
恰当用声是指用声音明示所有发现并指示所有进程，但是在没有接触气味时保持安静。
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