As the geological structure of the roadway special, up to 6 degree slopes to open up to 800 meters, must continue to move straight to open up a Lane, which is very difficult to upgrade.
由于该巷道地质构造特殊，以6度斜坡向上开拓到800米后，还需继续向前平直开拓一段平巷，这就给提升造成很大困难。
A man had told them to just go straight ahead but they had run into a narrow lane.
一位男子告诉他们只是一直往前走，但他们走进了一个狭小的车道上运行。
A man had told them to just go straight ahead but they had run into a narrow lane.
一位男子告诉他们只是一直往前走，但他们走进了一个狭小的车道上运行。
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