2. It must be innocuity, and has no stimulation, no side-effect and noninteracting with medicine. ҽҩ�б�����Լ����������̼����������Ҳ�Ӱ��ҩ�ԡ�
3. The so-called happiness, is to be hope that things get, the resulting psychological state of a fresh temporary period of continuous stimulation process. ��ν���֣����ǵõ��������õ����������������һ������״̬�����ʴ̼�������һ����ʱ�Թ��̡�
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n.
1. the act of arousing an organism to action
2. any stimulating information or event; acts to arouse action
3. (physiology) the effect of a stimulus (on nerves or organs etc.)
4. mutual sexual fondling prior to sexual intercourse