he cannot be sure
他不能确定
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But he says he cannot be sure why Mariam Khatib died until the samples are analysed.
BBC: Middle East
But he cannot be sure that the commission's recommendations will conform to the government's modest wishes.
ECONOMIST: Lords reform
Some will say he didn't mention them because he cannot be sure of achieving either growth or deficit reduction in 2012.
BBC: George Osborne chooses his words carefully
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