Kaesong, however, has been closed periodically because of tensions between the two countries.
The Buffalo airport, which was closed periodically until last night, recorded the greatest depth of snow on the ground since records started being kept, around 1870.
In contrast, grass fields need time to take root and must be closed periodically for proper maintenance.
Many West Bank schools have been closed periodically due to military curfews since the start of the Palestinian uprising in 2000.
But his magnificent Gas Works Park, which opened in 1980, has been closed down periodically by the Environmental Protection Agency, because of contamination fears.
By being close to post-partum women and visiting them periodically, TBAs are in an advantageous position to detect complications such as retained products.
Convention Hall, which once played host to the biggest names in rock 'n' roll, is not as busy as it once was, but after its reopening in 1996 -- it had been periodically closed during the 80's and totally closed since 1990 -- it draws people for concerts by rock groups like Everclear, Green Day and Indigo Girls.
All three robots are to arrive more or less simultaneously because the orbits of Mars and Earth, as happens periodically, are coming into unusually close alignment.
Throughout the region, schools have been periodically closed, flights grounded and the elderly issued with pollution masks as smog levels spike.
The western approach to the airport from Llantwit Major will be periodically closed but the eastern approach from Cardiff and Barry will remain open.
It's not even necessarily a bad thing that Rose, with his two hurt ankles and an ever-growing injury history section on his Wikipedia page, should periodically sit out until he's closer to 100%.
