I bought the Chinese version of Programming Ruby

Yesterday morning,When I read the 4.2.3 chapter of the ruby book named <Programming Ruby>,I couldn't understand the meaning of this chapter.I have been reading this book for 2 weeks,but I only read fifty pages.I thought of the speed was too slowly and it was waste of time,then I bought a Chinese version of this book.

After I bought the Chinese book I know the meaning of 'Closure'.'Closure'  is a  new  jargon which I had heard of a year ago.Although I know it,I didn't know what it means.The following is a example which is showed in <Programming Ruby>,but I don't know where I can use this new feature.

ruby 代码

def n_times(thing)
return lambda {|n| thing * n }
end
p1 = n_times(23)
p1.call(3) ! 69
p1.call(4) ! 92
p2 = n_times("Hello ")
p2.call(3) ! "Hello Hello Hello "

This blog might be finished yesterday afternoon,but it was delayed by other thing.I wrote this blog as soon as I came in my office on this morning.