flint
Noun 打火石, 燧石, 极硬的东西
Invalid [化] 燧石

Dorothy Flint knew soon after her son William was born that she had a difficult child. He cried often and nursed nonstop.
威廉（William）出世后不久，母亲多萝西·福林特（DorothyFlint）就发现他是个难带的孩子。;