But if we are not sure about whether the effective freedom degree is more than 10, it is doubtful that selecting expanded uncertainty as twice as combined standard uncertainty.
但如果不知道有效自由度是否大于10，而直接取扩展不确定度等于两倍的合成标准不确定度是存在疑虑的。
He warned me against associating with people of doubtful character. As if I ever should!
他申饬我不要同可疑的人来往，好像我真会那样子做似的！
Aloft in the air, as if from the depths of the cloud, came a confused and doubtful sound of voices.
高空中，仿佛自云团深处，传来一片可疑的嘈杂人声。
Aloft in the air, as if from the depths of the cloud, came a confused and doubtful sound of voices.
高空中，仿佛自云团深处，传来一片可疑的嘈杂人声。
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