在归纳论点分类下面，有一些次分类。
There are sub categories within the category of inductive arguments.
这是第一次利用自然分类系统开发药物输送技术。
This is the first time this natural system has been exploited for drug delivery.
新闻网站可能每个月只修改顶级分类列表一次。
A news site might only change its list of top-level categories once a month.
不过，要经过两年，分类能力才发生一次显著的变化。
Two years, however, are necessary for an obvious change in classifying ability.
不过，要经过两年，分类能力才发生一次显著的变化。
Two years, however, are necessary for an obvious change in classifying ability.
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