essential problems

• 基本问题

essential problems的用法和样例：

例句

1. After the basic experiments,we'll have to get down to more complicated problems.
   在解决基本问题后，我们势必将面临更多复杂的问题。
2. Some basic problems and biogenesis on natural products research were analysed.
   分析了天然产物研究中的基本问题和生源研究。