【建筑】扁平钥匙【建筑】平键

Flat Screen

cardinal plane【电讯】;main plane【航】;primary flat【电子】

flat-bed sewing machine, free-arm sewing maschine

mud flat

flat-footed

flat fillet

flat die forging【机】;open die forging【机】;

plate link chain (flat articulated chain)