There are two main lines of research.
有两条研究主线。
Seeing from full text, the article establishes in two main lines.
从全文来看，文章建立在两条主线之上。
Leave two blank lines after the abstract, then begin the main text.
留下两个空行后的抽象，然后开始正文。
Leave two blank lines after the abstract, then begin the main text.
留下两个空行后的抽象，然后开始正文。
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