One sort of opens up the beginning of life here and the other closes it down through a referencing of death.

前者讲的是生命的开始,后者通过诠释死亡,讲述了生命的终结

耶鲁公开课 - 聆听音乐课程节选

The "I'll" pattern of course, it means the same thing as the "I will." It's only the contraction.

当然，“I'll” 与 “I will” 句型都表达同样的意思。前者仅仅只是后者的缩写形式。

I will 课堂 - SpeakingMax英语口语达人

It depends on n and k but obviously as n gets big, that one is going to be better.

但是很明显，当n取很大的值的时候,前者要比后者好。

麻省理工公开课 - 计算机科学及编程导论课程节选