｢束縛｣: It means bound.
This tee let is come from President Reagan's remarks following the loss of the Space Shuttle Challenger and her crew, Broadcast at 5 p.m. EST, Jan. 28, 1986.
Flight of the Space Shuttle Challenger on Mission 51-L began at 11:38 a.m. Eastern Standard Time on January 28, 1986. It ended 73 seconds later in an explosive burn of hydrogen and oxygen propellants that destroyed the External Tank and exposed the Orbiter to severe aerodynamic loads that caused complete structural breakup. All seven crew members perished.
On the night of the disaster, President Ronald Reagan gave a national address on the Challenger disaster, the end of statement he quoted from the poem "High Flight" by John Gillespie Magee Jr.:
We will never forget them, nor the last time we saw them, this morning, as they prepared for their journey and waved goodbye and 'slipped the surly bonds of Earth' to 'touch the face of God.'