drawbridge/ˈdrɔ:brɪdʒ; `drɔˌbrɪdʒ/ nbridge (esp formerly across the moat of a castle) that can be pulled up to stop people crossing 吊桥（尤指旧时跨越城堡护壕的） lower/raise the drawbridge 放下[拉起]吊桥. =>illus at castle 见castle之插图.
牛津英汉双解词典