To date, the Ministry of Commerce has yet to grant a single round-trip investment approval under the 2006 rules.

WSJ: Scott A. Jalowayski: A Private-Equity Boost for China

The two nuclear-capable planes flew from Whitman Air force Base in Missouri to South Korea as part of a "single, continuous" round trip mission during which they dropped "inert munitions on the Jik Do Range", the statement said.

BBC: US B-2 stealth bombers in South Korea drill

If humans ever do go to asteroids or Mars, the scale of the infrastructure needed to complete a safe round trip could not possibly be launched on a single rocket from Earth.

BBC: Manned flight around Moon considered

We're going to see how it performs on my daily commute, try to assess how much it costs to run and take it for a trip round Northern Ireland to see whether we can visit each of the six counties in a single day on battery power alone.

BBC: Northern Ireland