在美中两国的交锋中，常常听到芬太尼。尤其近日美中打响贸易战，美国总统特朗普反复施压，表示“希望中国停止向我们输送芬太尼，如果不停止，关税将大幅提高”。那么芬太尼（fentanyl）是什么？为什么美国会在这个问题上指责中国，甚至对美中关系产生巨大影响？

Mexico's government, under mounting pressure from President Trump to curb drug trafficking, announced Friday that it had seized 18 kilos of fentanyl hidden in a bus. Mr. Trump has cited illegal ...

Canada has named a former deputy commissioner with the Royal Canadian Mounted Police as the country’s fentanyl czar OTTAWA, Ontario -- Canada on Tuesday named a former deputy commissioner with ...