Bill of lading by the carrier only to add "weight unknown" clause to protect themselves.

承运人只有通过在提单中加入“重量不知”条款才能保护自己。

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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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Use a wire sling of a greater S. W. L whenever the exact weight of the load is unknown or there is a hazard to personnel.

当无法确定载荷的准确重量或对人员存在危险时，使用大于安全工作负荷的钢丝绳。

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"Runners usually fatigue late in the last six miles of the marathon, and when you are carrying weight it is more of a step into the unknown, but I am confident I will come in at under three hours and a half and beat the record, " said Mr Ellicock.

BBC: London Marathon: Ex-paratrooper runs for record

The Zumwalt has the power, cooling, space and weight margin designed to meet the full spectrum of future threats, both known and unknown.

CENTERFORSECURITYPOLICY: Countering Beijing's new weapon

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