This was familiar ground and far more interesting than military operations.

她对这方面可是颇为熟悉，而且比对军事措施有兴趣得多呢。

In his latest book, McManus returns to more familiar ground.

【ground】在他最近出版的书中，麦克马纳斯又谈起了人们更熟悉的话题。

Beneath his feet was aerial space and the unknown; above him was the firm, familiar ground, and upon it all that he loved best.

脚下是虚空， 是未知； 在他上方是坚实、熟悉的地面， 上面是他最喜欢的一切。