The study concluded that "the mechanism of this weight loss is unknown [but] it would appear reasonable to include grapefruit in a weight reduction diet."

研究得出结论是这种减轻体重的机制还未知道，但相信包括葡萄柚等类似的减肥饮食的合理原因会浮出水面的。

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Parkinson's disease is caused by the degeneration of neurons in the midbrain. The mechanisms leading to the loss of these neurons, however, are largely unknown.

帕金森氏症是由中脑中神经细胞的退化导致的疾病。这种机制导致了这些神经的缺失，然而现金大部分机制还不清楚。

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The Newton iteration method is used to solve the economic pressure on the unknown node, so as to calculate the economic head loss and economic pipe diameter of each section,.

采用牛顿迭代法来求解各未知节点的经济水压，进而得出各管段的经济水头损失、经济管径和水源二级泵站的经济扬程。

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Relinquishing personal information on a pop-up box or unknown source could lead to the loss of money or identity theft.

FORBES: Cyber Crooks See Huge Opportunity In Japan's Tragedy

Dr Eric Karran, from the charity Alzheimer's Research UK, said the exact connection between hearing loss and cognitive decline was still unknown.

BBC: Hearing loss in 'brain decline link'

At the time the FDA said the drug resulted in "significant" weight loss but the agency said it was concerned about a possible risk of birth defects and an unknown impact on the heart.

WSJ: Federal Panel Approves Weight-Loss Drug Qnexa