Bone of contention：a subject or issue over which there is continuing disagreement；Main issue of a disagreement that two people or groups cannot go long with. （争议的焦点; 争执所在；尤指那些人们争论了很久的事物。）
中文释义：现实生活中，人们都会因纷繁复杂的事情而进行争论或争执，有的时候愈演愈烈，造成两败俱伤。如果两只狗都想争夺一块骨头，它们都不会放弃争夺，这块骨头就是它们争执所在。因此，便有人将这句习语引申为了如今的含义。
以下是实用短语“Bone of contention”在美剧语料库中的应用举例：
E.G.1：Nice. Attack him on all fronts. We have clients everywhere. Finding a bone of contention with him seemed the least I could contribute. （Suits S02E15 26:03 ）
参考翻译：很好 全线出击。我们的客户遍布全球，找他的茬（找到一个与他斗争的焦点）是我能做的最简单的贡献了。
E.G.2：I wonder what kind of relationship you had with your father. — Look, my father’s not up for discussion. The only bone of contention between them is this decision. （Suits S02E05 12:21）
参考翻译：真好奇你和你父亲关系如何？– 我父亲不在讨论范围内，他们争论的焦点在于（目前的）这个决定。
E.G.3：A serious bone of contention between the landowners and the developers was the compensation price for the land.
参考翻译：土地所有者和开发商之间的一个严重争论焦点是土地的补偿价格。
E.G.4：The fact that Peter did not go to medical school is a bone of contention between him and his father.
参考翻译：彼得没有上医学院这一事实是他和他父亲争论的焦点。
