关键议题的英语短语通常是 "key issues" 或者 "critical issues"。例如：

We need to address the key issues at the meeting today.
The critical issues that need to be addressed include budget constraints and staffing shortages.

另外，还有一些常用的表达方式，如 "main points" 或者 "central points"。例如：

Let's focus on the main points of the discussion.
The central points of the plan are to increase efficiency and reduce costs.

总之，要表达关键议题，有很多不同的英语短语可以使用，根据上下文和个人喜好选择即可。