n.打火石；极硬的东西
It is possible to strike fire from flint. 火石可以打火。
He has a heart of flint. 他有一副铁石心肠。
She gave him a look as hard as flint. 她冷酷地瞪他一眼。
n.燧石(打火石)
n.吝啬鬼
n.燧石发火装置；燧发枪
adj.燧石的；坚硬的；固执的
