因为a lot of ground 实际是cover 的宾语，所以，cover a lot of ground 是固定搭配。这是一个英语习语，意为“涉及的范围很广”。具体语境具体意思，请仔细体会。例如：

1. Encyclopedia Britannica said: Wikipedia can cover a lot of ground but you have to wonder about its accuracy and objectivity. 《大英百科全书》说：“维基百科确实能包括不少内容，但是大家或许会怀疑它的准确性和客观性”。

2. The expedition covered a lot of ground.  探险队到过很多地方。

3. They managed to cover quite a lot of ground in a short programme.  他们设法在一个短小的节目中包罗了多方面的内容。

4. We covered a lot of ground on our tour of Spain.  在西班牙旅游时，我们去了许多地方。

5. We've covered a lot of ground today. Next time we'll have a review class.  今天我们学了很多东西，下一堂课我们温习。

6. He managed to cover a lot of ground in a short talk.  他在简短的谈话中涵盖了许多领域。

7. The history course covered a lot of ground in six weeks.  历史课在六周内涉及很广。

8. Our meeting has progressed well, covering a lot of ground.  我们的会开得不错，讨论了许多方面的问题。

9. We've covered a lot of ground at this morning's meeting.  在今天上午的会议中我们讨论了很多问题。

10. We've got a lot of ground to cover today. 我们今天有很多的事情要做（说，应对，处理等）。

11. Before, we had a lot of ground to cover, and now it’s more open-ended and gets kids thinking. 以前，我们要教的东西很多，而现在则更开放，能让孩子们动起脑筋来。

12. You’ve got a lot of ground to cover, so don’t expect to do it in one evening! 你还有很多事要做，所以，别想着一个晚上就能完成！