1. The astronomer presented a new concept of the beginning of the universe. ��λ����ѧ�������һ��������Դ���¸��
2. Unless I am a physician among physicians they would not believe that I am an astronomer. ��������ҽ��֮ҽ�����������Dz�����������һ������ѧ�ҡ�
3. Chris Darwin, whose great-grandfather was Darwin's astronomer son George, is a tour guide and adventurer in the Blue Mountains west of Sydney. ����˹