If a needle is thrown at random on a sheet of paper (ruled with lines whose distance apart is exactly equal to the length of the needle) , how often can it be expected to fall on a line and how often into a blank space?是什么意思_If a needle is thrown at random on a sheet of paper (ruled with lines whose distance apart is exactly equal to the length of the needle) , how often can it be expected to fall on a line and how often into a blank space?在线翻译_英语_读音_用法_例句