| 1. | I do not know for sure . that is why i plan to go and take a look .
我不确知，那就是为什么我要去看看的原因。 |
| 2. | There is no way we can know exactly why the megalith builders set the big stones into the ground .
我们无法确知为什么古建筑者把巨石嵌入地面。 |
| 3. | In fifteen years or so the experts will know for sure whether the fish can survive in its new home .
15年左右，专家们将确知这种鱼是否能在它们的新家生存下去。 |
| 4. | A check by conventional means will confirm that these are the equations of motion of the two masses .
用传统的方法进行检验，就能确知这就是两个质量的运动方程。 |
| 5. | If they are grouped into larger units one can ascertain what group an unknown plant belongs to .
如果把它们归类成较大的单位，那么就可以确知某种未知植物属于何类群。 |
| 6. | Owing to the difficulty of sampling beneath the deep oceans, the composition of the oceanic crust is not known with complete certainty .
由于在深海底下取样困难，海洋地壳的组成就不完全确知。 |
| 7. | It was clearly established there was a maximum energy to the emitted electrons but its value was not well known .
出射电子具有最大能量的概念已经清晰地建立起来了，但并不确知该最大能量的值究竟是多少。 |
| 8. | No one really knows what motivated him to do so
没有人确知他那样做的动机是什么。 |
| 9. | No one is certain if the legend is true or not
没人确知这传说是不是真的。 |
| 10. | The coal mines safety appraisal based on unascertained set
基于未确知集的煤矿安全评价 |
