1. The old tree behind our house was riven by lightning last night. ���Ƿ���Ĺ�������ҹ�ﱻ�������ˡ�
2. "How often do a bunch of Santas just go and wreak havoc?" Rive said. "It was a random act of stupidity" that upset moviegoers. ����ܷ�ŭ��˭֪�����ʥ�����˸���û����������أ������������ܹ��ڵ���Ϊ�����Ǻ����ġ�
3. The BBC science reporter says research so far has been hampered by ethical issues surrounding stem cells to rive from specially grown human embryos. BBC�Ŀ�ѧ������Ϊ�����о�����ǣ����ǰ��ϸ�����������ڳɳ�����̥������ĵ�������������á�
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v.
1. tear or be torn violently
2. separate or cut with a tool, such as a sharp instrument