I can give you stronger pain-killing drugs if these aren't strong enough.如果这些止痛药药力不够的话，我可以给你一些药效更强的。For three years I managed without pain-killing drugs.我有三年时间没有吃止痛药。Some doctors carry out mercy killings by giving large quantities of pain-killing drugs.有些医生以给病人服大量止痛药的方式来实行安乐死。