A continent round the South Pole, situated mainly within the Antarctic Circle and almost entirely covered by ice sheets. Its exploitation is governed by an international treaty of 1959, which was renewed in 1991.
南极洲（南极周围的一大洲，主要位于南极圈内，几乎全为冰层所覆盖）
Definition of Antarctica in US English:
Antarctica
proper noun
A continent around the South Pole, situated mainly within the Antarctic Circle and almost entirely covered by ice sheets. Its exploitation is governed by an international treaty of 1959, which was renewed in 1991.