1. Whether to show constant buttons. �Ƿ���ʾ������ť��
2. Click this button to add a new constant. �����˰�ť������һ���³�����
3. It is found that the type of each departmental effect is not constant, but various with the development of economy. �о����֣������ŵ��������Ͳ�����Զ�ǹ̶��ģ������ž��õķ�չ����������ת�䡣
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n.
1. a quantity that does not vary
2. a number representing a quantity assumed to have a fixed value in a specified mathematical context adj.
1. persistent in occurrence and unvarying in nature
2. continually recurring or continuing without interruption
3. steadfast in purpose or devotion or affection
4. uninterrupted in time and indefinitely long continuing
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