Walk ---- the bridge,---- the---- ----- ----- the left and them ---- ---- ----until you reach theend穿过桥,在第一个楼口左拐,然后一直走到路的尽头

Walk (across) the bridge,(take) the (first) (turning) (on) the left and then (go) (straight) (on) until you reach the end.
穿过桥，在第一个楼口左拐，然后一直走到路的尽头。

Walk 【across】 the bridge,【take】 the 【first crossing/turning on】 the left and then 【go straight on】 until you reach the end.go straight on 表示“一直向前走”,介词on可以省略,比如：Turn right at ...