As the months passed, he improved the device.

VOA: special.2010.07.20

They would return when the winter months had passed.

VOA: special.2009.01.07

South Korea warns any long-range launch by the North will be a violation of a U.N.resolution passed in 2006, when North Korea conducted long-range missile and nuclear weapons tests within months of each other.

VOA: standard.2009.03.12