1. The equator is an imaginary circle around the earth. �����һ��Χ���ŵ���ļ����Բ��
2. Water tends to move from the poles toward the equator. ���ˮ���������ɼ�������������ƶ���
3. Whale sharks are found worldwide, generally about 30 degrees north and south of the equator. ������������ؾ��з��֣�ͨ�����ϱ�γ30��֮��ij��������
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n.
1. an imaginary line around the Earth forming the great circle that is equidistant from the north and s
2. a circle dividing a sphere or other surface into two usually equal and symmetrical parts
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