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本期内容：
Bombs packed with nails terrorized Brussels on Tuesday in the deadliest assault on the European heartland since the Islamic State’s attacks on Paris four months ago, hitting the airport and subway system in coordinated strikes that were also claimed by the militant extremist group.
词义解析:
Assault: 攻击
Heartland：腹地
Militant extremist group: 武装极端组织
