focal problems

• 焦点问题

focal problems的用法和样例：

例句

1. The controlling factors for the hydrocarbon accumulation in the Cretaceous strata in the Jiangling depression have long been one of the controversial problems.
   摘要作为江陵凹陷油气勘探的领域之一，白垩系在许多关键问题上还存在分歧和争议，白垩系的成藏主控因素是争论的焦点问题之一。