We need a stable political environment in which to develop our economy.
我们需要一个稳定政治环境来发展经济。
Americans are hight mobile, and therefore may find it difficult to became deeply involued with other.
美国人的流动性,大,因此你会发现和他人深交很难。
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.