1. The kids are bouncing on the mattress. �������ڴ�����������ȥ��
2. How Good is Your Ball Bouncing Accuracy? ��ô�ã����������ȷ�ԣ�
3. The bouncing grains strike the ground, either bouncing into the air again or dislodge other grains. �����ŵ����ӳ�����棬���������½������������ײ����һЩ���ӡ�
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n.
1. rebounding from an impact (or series of impacts)
2. vigorously healthy
3. marked by lively action