他指出，只有相对于初始的背景条件，才有可能将特定因素确定为特定历史事件的主要原因。

He points out that it is possible to identify specific factors as the primary causes of a particular historical event only relative to an initial set of background conditions.

youdao

在这相对短暂的时间里，人们的生活条件发生了比之前几千年更大的变化。

During this relatively short period of time, greater changes in people's living conditions have occurred than in the thousands of years which preceded.

youdao

当环境条件稳定时，偏离率相对较低，但当河流受到严重干扰时，偏离率会急剧增加。

Straying rates remain relatively low when environmental conditions are stable, but can increase dramatically when streams suffer severe disturbance.

youdao

So perhaps in the relevant sense, the person can still engage in P-functioning, so they're not dead. Good enough.

所以也许在相对的条件下，这个人还有人格功能性，他们还没有死，很好。

耶鲁公开课 - 死亡课程节选

The answer is it will want to reform with itself, and if I have these in solution then how many reform with itself and how many reform with the molecule I'm interested probably depends on the relative concentrations of both in the solution and what conditions I have it at.

答案是质粒有可能会自己闭合,如果质粒和我感兴趣的DNA片段,都在溶液里那有多少质粒会自己合上,有多少与我感兴趣的DNA重组呢,这大概取决于两者在溶液里的相对浓度,和我让溶液处在什么条件下

耶鲁公开课 - 生物医学工程探索课程节选