1. thorny

Today we are going to learn “thorny”. It here means a question etc that is complicated and difficult.
(1) The American government, like every government, has its share of thorny problems.
(2) Russian President Vladimir Putin visited France to talk about Syria, the Ukrainian crisis and other thorny issues.


2. wealth

Another word is “wealth”. It means a large amount of money, property etc that a person or country owns.
(1) The great wealth taken from the gold and silver mines was usually invested in other businesses: shipping,railroads,factories, stores,land companies.
(2) That means that a person can rise from poverty to wealth and success if he or she works hard.