1. The invention of the microchip announced a new generation of computers. оƬ�ķ���Ԥʾ����һ��������ĵ�����
2. The faces around him displayed nothing but shock; he might have announced that he wanted to borrow one of their arms. ����Χ�������ֳ�����ɫ��������������������������Ҫ������֮һ��������
3. In 2003, President Bush announced a plan to return humans to the moon by 2020 and use the moon as a base to go on to Mars. 2003�꣬������ͳ��ʲ������һ��ƻ���Ŀ����ʹ������2020�����µ�½��������������Ϊ��½���ǵĻ��ء�