1.走江湖(卖假药)的人;江湖医生;江湖骗子
1.someone who pretends to be someone they are not or pretends to be able to do things they cannot do
1.You get fakes, cheats, mountebanks the world over.
走遍世界各地都免不了要遇到冒名顶替者、骗子和夸夸其谈的江湖客。