the situation in which a country or place is surrounded by soldiers or ships to stop people or goods from going in or out

an air and sea blockade 空中及海上封锁

The Soviet blockade of Berlin was lifted in May 1949. 苏联对柏林的封锁于1949年5月解除。

There is still some hope that the economic blockade will work and make military intervention unnecessary. 经济封锁仍有望发挥作用，这样就不必采取军事干预。