是介詞,意思是：沿著.
down the narrow street,沿著狹窄的街道原句是這樣的He got up and ran across the square and then down the narrow street. 介詞的話不是很奇怪。。。還有，能幫忙翻譯下嗎謝謝He got up and ran across the square and then down the narrow street. 他起床（或者：起來）后跑過操場，然后沿著狹小的街道（繼續(xù)跑下去）。這句話中down是介詞。例如：he walks down the narrow street to school everyday