1) The natural Barriers for defense are insurmountable
天堑难渡
2) Transitional zone between embankment and cut
路堑过渡带
3) cut-fill transition section
路堤、路堑过渡段
5) It is difficult to pass a dangerous course
险道难渡
6) The Difficulty of Chinese Active Extradition
主动引渡难
补充资料:天堑
天然形成的隔断交通的大沟,比喻地势险要,不易通过:长江天堑|天堑变通途。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条