a very powerful bomb dropped from an aircraft that explodes close to the ground and destroys buildings and structures over a large area 摘菊使者，滚地球炸弹（杀伤范围大的空投炸弹） (in cricket or baseball 板球或棒球 a ball hit or thrown to roll or bounce low along the ground 擦地球；地滚球； 滚地球