1. Whether can cold virus kill cancer cell? ��ð�����Ƿ���ɱ����ϸ��?
2. However, sometimes the virus can sicken humans. ������ʱ��������ʹ�˻�����
3. Today, only about 25% of these animals get the virus. ���죬ֻ��25%���ҵ���Щ����Я��������
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n.
1. (virology) ultramicroscopic infectious agent that replicates itself only within cells of living host
2. a harmful or corrupting agency
3. a software program capable of reproducing itself and usually capable of causing great harm to files