topic training collection 专题训练集
topic collection
主题集合
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The nested structure gives a sequence and hierarchy of topics within a topic collection.
嵌套的结构在主题集合中给出一个主题序列和层次结构。
youdao
You may want to start by reading a collection of papers prepared for PCAST (pdf) on the topic.
WHITEHOUSE: PCAST Launches Policy Forum on the Future of U.S. Advanced Manufacturing | The White House
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