/ http://www.slideshare.net/images/logo.gif / 狠狠撸Share feed for 狠狠撸shows by User: jingtianhu https://cdn.slidesharecdn.com/profile-photo-jingtianhu-48x48.jpg?cb=1523496320 天演论云：“物竞天择，适者生存。”后亦有说：“万类霜天竞自由。”皆有万物遵循自然之法发展生息之意。