The process 空 energy is changed from one form into anther is called the transformation of energy
问题描述：
The process 空 energy is changed from one form into anther is called the transformation of energy
A by which B at which C on which D for which
选A 讲讲为什么
答
by是通过某种方式~by 和谁有关系呀 有时和前面有关系 有时和后面有关系 分不太清呀which是关系代词，指代前面的process，by which呢其实就是by the process，通过这个process...