Most of the data will be held in large legacy or package systems, for which the details of data structure may be unknown.
大多数数据将会存储于大型遗留或打包的系统中，数据结构的细节对于这些系统来说可能是不可见的。
Critics say there may be unknown risks.
评论家称，可能存在未知的风险。
The researchers think there may be unknown compounds in coffee that protect against the disease.
研究人员认为，咖啡中可能有不明物质抵御疾病。
Nature has secrets, and so do you. Your own secrets may be unknown even to you.
大自然有秘密，正如你们的心中也有秘密一样，甚至有时候连你自己的秘密你也不清楚。
The Economic future may be unknown, but the only way we'll get to the future is by living day-by-day and appreciating every day.
经济形势可能无法预测，但将来的日子还要一天天地过，所以要珍惜每一天。
The Economic future may be unknown, but the only way we'll get to the future is by living day-by-day and appreciating every day.
经济形势可能无法预测，但将来的日子还要一天天地过，所以要珍惜每一天。
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