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| 11. | Normally, helium is present in less than1% by volume in natural gas. |
| 正常情况下，氦在天然气中的体积比是1%氦要经过回收、纯和液化过程。 |
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| 12. | Normally, helium is present in less than 1% by volume in natural gas. |
| 正常情况下，氦在天然气中的体积比是1%。氦要经过回收、提纯和液化过程。 |
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| 13. | Thus micro-organisms which are normally suppressed by others present in fresh foods may flourish once |
| 因此,一些在正常情况下被其它存在于新鲜食物中的微生物所抑制的微生物,一旦它们的竞争对手被辐照所消灭,就可能迅速繁殖。 |
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