Recently documented examples of neurogenesis(神经形成), the production of new brain cells, include brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that learn new songs. 绿色:主语青色:同位语,补充说明neurogenesis黄色:谓语深黄:平行That 可以修饰mice引导定语从句而when 不行,when引导定语从句只能修饰时间。如果理解成状语从句,这种情况从句是不能省略主语的。因为从句主语与主句主语不同。这里压根就没有逻辑主语的事,因为没有不定式或者that引导的宾语从句。-- by 会员 s7s7 (2007/6/10 17:47:00)
解释很清楚~~ |