Easterbrook began collecting African-related Obama items on a trip to the continent in 2007, when then Senator Obama was running for president.

VOA: standard.2010.07.10

So how long it takes to run is related to how many items I end up being able to fit into the knapsack.

所以，运行的时间是和我能够,装进背包的物品数目有关的。

麻省理工公开课 - 计算机科学及编程导论课程节选

So how long it takes to run is related to how many items I end up being able to fit into the knapsack.

所以，运行的时间是和我能够,装进背包的物品数目有关的。

麻省理工公开课 - 计算机科学及编程导论课程节选