1. The students perceived that his behavior had changed. ͬѧ�Ƿ���������Ϊ��Щ�仯��
2. It is vital that scientists should perceive the danger now before it is too late. ��Ҫ���ǣ���ѧ�������ھ�Ӧ�þ��쵽����Σ�գ�����Ϊʱ������
3. Your reactions to other people, however, are really just barometers for how you perceive yourself. ���ķ�Ӧ�������ˣ�����������Ǹղŵ��������Ϊ����ο����Լ���
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v.
1. to become aware of through the senses
2. become conscious of