保護(hù)區(qū)段 full block overlap: 全閉塞區(qū)段重疊block protection: 塊石護(hù)岸block section: 閉塞分區(qū); 閉塞區(qū)間section block: 區(qū)間閉塞child protection section: 兒童保護(hù)科下載手機(jī)詞典可隨時隨地查詞查翻譯
