Drop out like a knife stone, see the loss on loss.
辍学如磨刀之石，不见其损日有所亏。
youdao
He dropped the knife and it clattered on the stone floor.
他一失手，刀子当啷一声掉到石头地面上。
《牛津词典》
The knife--originally knapped stone--has been the partner of the needle since the Paleolithic era.
FORBES: Magazine Article
The design is first sketched on paper, and then engraved on stone, in reverse, with a knife.
UNESCO: Culture
Two men accused of plotting to murder singer Joss Stone were carrying a sword, a lock knife, a hammer and notes of their intentions, a court has heard.
BBC: Joss Stone murder plot: Accused pair 'had sword'
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