observation line

• 观测线,观察线

observation line的用法和样例：

例句

1. During that first exploration, we traced the major east-west fault line, called the Delphi fault, that de Boer had observed during the earlier survey.
   在第一次的调查期间，我们追查主要的东西向断层线，即狄波尔在较早的调查曾观察过的断层，名叫德尔菲断层。