1. The scan interval for zombie process. ɨ�轩ʬ���̵�ʱ������
2. In this document, however, a range is an abstract interval which subtends the numeric set. ����������ĵ��У���Χָ����һ���������䣬�����������ּ��ϡ�
3. However, there are situations in which it is important to let the user directly compare several variables and their development over the same interval. ���ǣ�Ҳ����������������û�ֱ�ӱȽϲ�ͬ�ı�������ͬ���ļ���ڵķ�չ����Ҳ�Ǻ���Ҫ�ġ�
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n.
1. a definite length of time marked off by two instants
2. a set containing all points (or all real numbers) between two given endpoints
3. the distance between things
4. the difference in pitch between two notes