Those are the rules and regulations, and we have to abide by them.
这些就是这儿的规矩, 大家都应该遵守。
There have been a lot of changes here in the last 20 years.
在这20年里这里有很多变化。
After switching on powerful arc lights, they saw great stalagmites -- some of them over forty feet high -- rising up like tree-trunks to meet the stalactites suspended from the roof.