Qhov twg siv cov yeeb nkab steel

Lawv siv underground rauthauj dej thiab roj thoob plaws hauv nroog thiab hauv nroog. Lawv kuj tau teev tseg hauv kev tsim kho los tiv thaiv cov xov hluav taws xob. Cov kav hlau hlau tuaj yeem muaj zog, tab sis lub teeb yuag.