摘要
In April this year, US President Barack Obama delivered a speech in the Czech capital, Prague, stating America's commitment to build a world without nuclear weapons. He said that as a nuclear power and the only country that had used nuclear weapons in actual combat,
In April this year, US President Barack Obama delivered a speech in the Czech capital, Prague, stating America＇s commitment to build a world without nuclear weapons. He said that as a nuclear power and the only country that had used nuclear weapons in actual combat, the United States should bear ＂moral responsibility＂. He alsopledged that the United States would take concrete steps towards a world without nuclear weapons, including negotiating a new nuclear weapon reduction treaty with Russia by the end of this year,
