Caveat: Researchers didn't analyze lung tissue from subjects. The concept that ra is generated outside the joints is speculative, they said. The study was small.

注意：研究人员并未分析研究对象的肺组织。他们说，风湿性关节炎源自关节以外这一观点目前还只是一个推测。这项研究规模较小。

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Many consumers are not impressed with the speculative concept of the iWatch, which sounds like a cross between an iPhone and a wearable iPod Nano.

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So this is to say that the idea should be treated as a speculative concept that may or may not have any connection to what is happening inside Apple.

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The concept is to take small positions in a large number of speculative stocks to reduce overall portfolio risk.

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