relation back
追溯效力
例句与用法：
Relation between the two countries has reached a crisis point.
两国关系已达到出现危机的地步。
A relation of mine is coming to stay.
我有个亲戚要来此暂住。
I don't see any relation between the two problems.
我看不出这两个问题间的联系。
He is a near relation of mine.
他是我的一个近亲。
Their relationship has lasted many years.
他们的感情已经有很多年了。
词形变化：
形容词: relatable | 名词: relater | 动词过去式: related | 动词过去分词: related | 动词现在分词: relating | 动词第三人称单数: relates |