I'm sure he knew of this poisonous cycle.
我相信他知道这种恶性循环的存在.
Do you know of any medicine that can relieve headaches instantly?
你知道有能立即解除头疼的药吗?
- Is there a medicine that relieves headaches immediately?
有没有能立即解除头疼的药?
- Not that I know of.据我所知,没有.