2. Well, that, of course, is impossible. �������ǵ�Ȼ�Dz����ܵġ�
3. It is impossible for me to finish the task in a week. ��������˵��һ���������������Dz����ܵġ�
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n.
1. something that cannot be done
2. not capable of occurring or being accomplished or dealt with
3. totally unlikely
4. used of persons or their behavior