两条主线
基于1个网页-相关网页
two main lines
以上为机器翻译结果，长、整句建议使用 人工翻译 。
There are two main lines of research.
有两条研究主线。
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About 250 investigators are pursuing two main lines of inquiry - an Islamist motive or the far right.
BBC: Toulouse school killer 'had camera around his neck'
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