But road travel from the sites remains difficult. The general says there are more than 1,400 flights on a waiting list to land in Port-au-Prince.

VOA: standard.2010.01.21

Lisp The problem with that technique, while it's very general, is how long does it take me to find the i'th element of the list?

很多编程语言包括，都是用了这种技术,这个问题就是，当数组很大的时候？

麻省理工公开课 - 计算机科学及编程导论课程节选