n.打火石；极硬的东西
用作名词 (n.) It is possible to strike fire from flint.
火石可以打火。
This layer of rock contains a lot of flint.
这一岩层中有大量燧石。
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。
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