California state senator Gloria Romero says the problem with that was asbestos which is often found in the rock.

VOA: standard.2010.07.26

And then they found the problem.

卡住了一个虫子。

麻省理工公开课 - 计算机科学及编程导论课程节选

And then they found the problem.

卡住了一个虫子。

麻省理工公开课 - 计算机科学及编程导论课程节选