A rampart built around the top of a castle with regular gaps for firing arrows or guns .

围绕城堡 顶部建的防御工事，它上面均匀地分布有 枪眼或弓箭眼。

Temperature difference from top to bottom in preheating zone of tunnel kiln is the biggest obstacle for rapid firing energy saving .

隧道窑预热带内 上下温差过 大是实现快速 烧 成、节能降耗的最大障碍。

Development and practice of 2nd generation top firing hot blast stove

第二代 顶 燃式热风炉的研制与实践

Development of Top - Firing Air and Gas Self - Preheating Hot Blast Stove

顶 燃式空气、煤气自身双预热热风炉的开发与应用