Presheaf
预层
🗣️ 情景例句
He is as poor as a church mouse.
他一贫如洗。
He who is ashamed of asking is ashamed of learning.
耻于问者耻于学。
It makes no difference that the forgery may have been a very skilful one:
即使伪造得很巧妙，也不能付款，