flank wall的用法和样例：
例句
- Located in the history of the frontier fortress, the wall remains the same, Castello, still, people sincerely feel the history of the atmosphere.
地处历史上的边塞，边墙依旧，堡城依旧，让人由衷地感受到了历史沧桑的氛围。 - Tunnel refection seismology employs sources and receivers that are mounted inside the tunnel wall or tunnel face and aims to predict rock properties ahead of the tunnel.
摘要隧道反射地震法是利用放置在隧道边墙或者掌子面内的震源和接收器，来预测隧道前方的岩石特性。
