1. Pollution in the air reduced the visibility near the airport. �����е���Ⱦ�����˻����������ܼ��ȡ�
2. Clicking the Make Visibility Dynamic button creates a Visibility variable. ��һ�°�ť��ʹ�ܼ��ȶ�̬����һ���ɼ�������
3. You can't manage what you can't see, however, and network probes provide that visibility. Ȼ�����������Ķ����Dz��ܹ����ģ�����̽ͷ�ṩ�����ֿɼ��ԡ�
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n.
1. quality or fact or degree of being visible; perceptible by the eye or obvious to the eye
2. degree of exposure to public notice
3. capability of providing a clear unobstructed view