N-COUNT A penknife is a small knife with a blade that folds back into the handle. 小折刀
He had a penknife with a spike for getting stones from a horse's hoof, and I helped him to carve my initials.
他有一把用来从马蹄上取石头的带钉小刀,我帮他刻上了我名字的首字母。
His appetite for inventions went back to his childhood when he had devised a fork and spoon that could fit into a penknife.
他对发明的兴趣可以追溯到他的童年时代,那时他发明了一种可以放入小刀的叉子和勺子。
Thus a little knife was needed to keep the pen trimmed, which is why a penknife is called a penknife.
因此,人们需要一把小刀来打磨笔尖。于是有了小折刀(penknife)这个词。
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