ground zero

noun

/ˌɡraʊnd ˈzɪərəʊ/

/ˌɡraʊnd ˈzɪrəʊ/

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[uncountable, countable] the point on the earth’s surface where a nuclear bomb explodes（核弹的）爆心投影点
Ground Zero
[uncountable] the site of the Twin Towers in New York, destroyed on 11 September 2001归零地（2001 年 9 月 11 日炸毁的纽约双子大楼遗址）
CultureThe Twin Towers were two very tall office buildings in Manhattan, New York City, built by the Port Authority of New York and New Jersey in 1972-3 and housing offices of the World Trade Centers Association. For a short time they were the tallest buildings in the world. Each was 1 368 feet/417 metres high and had 110 floors. A terrorist bomb exploded in the garage of the building in 1993 killing six people and injuring more than a thousand. On September 11th 2001 the Twin Towers were both destroyed in another terrorist attack. Two planes crashed into the towers, and a short time later both towers collapsed. The area where the building used to be became known as Ground Zero, and is now called the World Trade Center Site. It is the site of the National September 11 Memorial and Museum.see also September 11
[uncountable] the beginning; a starting point for an activity开始；起点