明朝诗人于谦在《石灰吟》中写到：“千锤万凿出深山，烈火焚烧若等闲。
B-Time I-Time B-Person I-Person I-Person I-Person O B-Abstract I-Abstract I-Abstract I-Abstract I-Abstract O O O O O O O O O O B-Location I-Location O B-Thing I-Thing O O O O O O