Hot air balloons use ordinary air as the liftinggas.
热气球缓缓地升上了天空。
2
This paper presents the technology of caissons′ lifting up by liftinggas bags and caissons′ moving by traveling gas bags, which are compared with the traditional technology.
主要介绍了顶升气囊顶升沉箱的工艺及与传统工艺的比较、行走气囊移动沉箱工艺及与传统工艺的比较。
3
The explosion of the Hindenburg showed the dangers of hydrogen as a liftinggas and resulted in new emphasis on helium, which is not flammable, rather than ending the reign of rigid airships.