| 1. | Most big balloons are now filled with helium .
现在许多大气球中充的是氦气。 |
| 2. | Design and study of a reciprocating helium compressor
大功率活塞式氦气压缩机的研制 |
| 3. | Development of new helium gas bearing turboexpander
新型氦气体轴承透平膨胀机的研制 |
| 4. | He plans to circumnavigate the world in a helium balloon
他计画搭乘氦气球环绕世界一周。 |
| 5. | He tied them to a lawn chair and filled them with helium
他将气球绑在折椅上并注入氦气。 |
| 6. | A gift box is accompanied with the balloon for delivery
气球送递时均已填充氦气、连礼物盒。 |
| 7. | Hydrogen provided more lift than helium
氢气的上升性能优于氦气。 |
| 8. | A carrier gas filter system is recommended to be installed on the helium line ( he )
在氦气管路前面建议安装气体净化装置。 |
| 9. | They also discovered that the helium in the balloons would last for six hours
他们也发现汽球中的氦气有效时限可达六小时。 |
| 10. | The planets ' strong force of gravity holds huge amounts of hydrogen and helium gas
行星的巨大引力吸引了大量的氢气和氦气。 |
