本期内容：

An explosion in Kabul killed at least 28 people and injured more than 300. Reports said that a car bomb went off in a crowded central area of the Afghan capital and that gunmen then fought the security forces. The Taliban, which recently said it was beginning a spring offensive, claimed responsibility for the attack.

词义解析:

Explosion: 爆炸
Gunman：持枪歹徒
Spring offensive：春季攻势