1. There are a lot of unproven allegations flying around. 有很多未经证实的谣言在迅速传播开来。
2. Even setting aside the unproven hints of ancient oceans, the extent of the outflow channels suggests that a huge total volume of water existed on Mars in the past. 即使不考虑未经证实的古代海洋迹象，流出渠道的范围表明，过去火星上存在着大量的水资源。
3. This is particularly true with unproven new products. 对于还没有经过市场证明的新产品更是如此。
4. But an unproven intervention can do considerable harm. 但是，未经证实的干预可能相当有害。
5. All other methods of staying awake and alert at the wheel are unproven. 另外一些在开车时保持清醒和警惕的方法都是未经证实的。
