a connection or relationship between two or more things that is not caused by chance . A positive correlation means that two things are likely to exist together , a negative correlation means that they are not 相互关系；联系；相关
+between the correlation between personal wealth and health 个人财富和健康的相互关系
a significant/strong/high correlation There is evidence of a strong correlation between drinking and violence. 有证据表明饮酒与暴力之间存在着很强的相关性。
a direct/close/clear correlation There is usually a direct correlation between an older person’ s social status and their level of personal achievement. 年纪更大一些的人的社会地位和他们的个人成就之间通常有着直接的联系。