1996年夏季，我随全国多所著名院校的林业学者一起第一次走向长白山。
B-Time I-Time I-Time I-Time I-Time I-Time I-Time O B-Person O O O O O O O B-Organization I-Organization O B-Abstract I-Abstract B-Person I-Person O O O O O O O B-Location I-Location I-Location O