Research shows that income has a positive relationship with happiness (life satisfaction), although it is not a straightline.
研究表明，收入与幸福(生活满意度)呈正相关，但并非直接正相关。
2
So obviously, there's sort of a straight-linerelationship here.
所以很明显，这里存在着某种线性关系。
3
When the stree strain relationship is the weak hardening, the relationship between stress ratio and strain incremental ratio shows the straightline with two different slopes.