As anyone with a Roomba cleanerbot knows, robots easily become confused by something unexpected, like a piece of furniture in the wrong place. A barricade can be made of many objects, some unfamiliar, and none with convenient handles. Taking it apart is far beyond the capability of any industrial robot.
家里有Roomba扫地机器人的人都知道，机器人很容易被一些意想不到的东西弄糊涂，比如一件移动了位置的家具。障碍可能由很多东西组成，有一些机器人不熟悉的，而且不方便抓握的东西，工业机器人很难将它移开。
——《经济学人》
基本释义
barricade: A barricade is a line of vehicles or other objects placed across a road or open space to stop people from getting past, for example, during street fighting or as a protest.
n. 路障；障碍
追根溯源
这个词的barric部分来自法语barrique，表示“桶”的意思。1588年3月12日，巴黎发生了一次胡格诺（Huguenot）暴动，胡格诺教徒们将装满泥土，沙石等的桶推倒在街上，形成路障，堵塞主干道。这一天也被称为the day of the barricades，barricade就用来形容这种路障 ，后来泛指各种路障或者街垒。
另外，还有几个特别重要的单词与barricade意思相近，例如：
barrier /ˈbæriər/ n.屏障；障碍
obstacle /ˈɒbstəkl/ n.障碍物；干扰
blockade /blɒˈkeɪd/ n.封锁；障碍物在美剧《绯闻女孩》S2E5中，Blair气急败坏抱怨了起来，用到了barricade这个词：Don't they know that without me, they'd never see the inside of a fashion tent?! They'd be stuck behind the barricades with P.E.T.A.! In fact, I will leave them outside with P.E.T.A. Maybe that'll teach them some manners.
他们难道不知道没有我，他们永远都看不到时装篷里景象吗？他们会和动物保护组织一起被拦在围栏外！事实上，我会把他们丢在外面和动物保护组织作伴。可能会教会他们懂些礼貌。
