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

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