人们总是认为与快乐有关的事情是引起快乐的原因,但是恰恰相反,是快乐容易产生与快乐有关的事情. alomost always it has been thought that (从这到逗号前的部分做that引导的从句)things that (从这到逗号前的部分做things 的定语从句)are connected with happiness are the causes of happiness, but it could be just the opposite that (后面是that从句)those things tend to be caused by happiness.