battleground

But all too often, a relationship becomes a battleground where each partner becomes well schooled in the art of inflicting pain on the other.

不过一切太频繁，一段关系成为一个战场，在每一方在对别人造成伤害的艺术中成为好的学校。

Well, one can debate what these data show. But this much is clear: that little strip of plastic is a mini-battleground.

你可以质疑这些数据显示的结果，但是有一点是不容质疑的：小小的塑料扶手已成为了一个争夺战场。