by which 可以引导定语从句吗?
问题描述：
by which 可以引导定语从句吗?
答
可以呀!如：
Still he learnt something,by which he was to profIt subsequently.
他仍然学到了一些东西,他将来会从中得益的.
There are moral principles by which society coheres.
有些道德法则使社会得以团结一致.
来自《现代英汉综合大词典》