"with which to regulate them"请真懂的进来,谢谢!
The development of mechanical timepieces spurred the search for more accurate sundials with which to regulate them.
意思我明白,with which to regulate them这个定语从句是什么形式?为什么没有动词?to regulate?还是省略了什么东西,with如果还原到句子里面,应该加在哪里?
那to是干什么的?regulate是动词的话,前面怎么会加to?!