natural form的用法和样例：
例句
- This blue mould was in fact the natural form of penicillin which Fleming realized was an effective way of killing bacteria.
原来这些青色的霉斑正是青霉素的自然形式，弗莱明意识到青霉素是杀灭细菌的有效方法。 - Why are so many people more readily appalled by an unnatural form of dying than by an unnatural form of living?
为什么如此众多的人对非自然形式的死亡感到震惊而对非自然形式的生存漠视呢？
