cattle-grid
n (usu metal) grid covering a ditch in a road so that vehicles can pass but not cattle, sheep, etc 拦畜沟栅(通常为金属制的架子, 置於路中的沟上, 车辆可通过而牛羊等无法通过).
One day, he went to an exclusive shop in London and asked for 'Myrolite', the shop assistant looked puzzled and Harry repeated the word, slowly stressing each syllable.