区别就是两者意思是不一样的具体的不同如下
however中文意思是adv. 然而,可是,不过无论如何(用于表示惊讶)究竟怎样……左右,……上下,conj. 不管怎样,无论如何然而,可是
However, traders tended to discount the rumour.
suddenly中文意思是adv. 突然地,出乎意料地
We were suddenly disconnected.