为了研究无花果的授粉过程,常常要给果果穿上“外衣”人们常说开花结果,花是果的因,无花不结果,这就是因果关系。可是无花果的果子似乎是凭空长出来的—春天时,无花果枝头会冒出一些小绿球, In order to study the process of pollination of figs, it is often necessary to put on the fruit “garments ” people often say that the flowering result, the flower is the result of the fruit, no flowers, the result is causal relationship. But fig fruit seems to grow out of thin air - in spring, the fig branch will emerge some small green ball,