Now the glowing ball expanded quickly, rising like a helium balloon.

现在，这个发光的球体迅速扩大，像氮气球一样升起。

youdao

He also invented the Skyhook, an air rescue system that involved an airplane and a large helium balloon.

他还发明了高空吊运车，这是一种为飞机和大型的氦气球的空中救援系统。

youdao

Airship: a giant helium balloon would pump chemicals into the atmosphere via a 23km hose attached to the ground.

一个巨大的氦气球将化学物质通过一个与地面连接的23千米长的软管将化学物质泵到大气层中。

youdao

He also invented the Skyhook, an air rescue system that involved an airplane and a large helium balloon.

VOA: special.2009.01.14

That enormous, soft helium balloon got bigger and higher, until my love filled the skies.

CNN: Motherhood: What endless love feels like

Branson has transformed "trying" into a heroic enterprise--boosted by three unsuccessful attempts to circumnavigate the globe in a helium balloon.

FORBES: Red Baron

Aoki used to fly around in a helium balloon shaped like a Benihana chef, and raced Benihana speedboats with bright red logos.

FORBES: Business As Usual