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| 1. | But, no one knows yet how much methane, if any, is actually present in the mantle. |
| 然而，无人知晓，如果地幔中存在甲烷的话，究竟其储量有多少。 |
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| 2. | He actually was present during biological agent production runs. |
| 在生物制剂生产期间，他当时就在场； |
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| 3. | Why do modern people almost invariably ignore the things that are actually present to them? |
| 为什么现代人几乎无一例外地对实实在在展现给他们的事物视若无睹？ |
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| 4. | The method encounters difficulties if one considers a condensed species which is not actually present |
| 当我们研究一种平衡中实际上不存在的凝结组分时，用这种方法便有困难。 |
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