1. You should too in an earthquake. ����ʱ����ҲӦ����ô����
2. Earthquake is a nightmare. ������һ��ج�Ρ�
3. What is the biggest earthquake ever? ʷ�����ĵ�����ʲô��
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n.
1. shaking and vibration at the surface of the earth resulting from underground movement along a fault
2. a disturbance that is extremely disruptive