There were no severe complications in photodynamic therapy or percutaneous cryoablation with argon-helium system.

无论光动力抑或经皮氩氦系统冷消融，均未发生严重并发症。

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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。

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Lockheed Martin's Persistent Threat Detection System is a tethered aerostat filled with helium designed to stay aloft for long periods of time to provide surveillance of broad areas.

洛克希德·马丁公司的持续威胁探测系统是一个长时间的高举的氦气填充的系留气球的设计，这种设计是为了提供广泛的监视领域。

youdao

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

VOA: special.2009.01.14

He goes back and redoes the calculation, only in this case he says what I am going to do is I am going to redo the calculation for helium, but I am going to consider not just the mass of the electron but the reduced mass of the system.

他回去重新做了计算，仅在这种情况下他才会说说我将要,为氦重做计算，但我认为,不只是电子的质量,还有系统质量的减少量。

麻省理工公开课 - 固态化学导论课程节选

So, helium plus is a one electron system.

所以氦正离子是一个单电子系统。

麻省理工公开课 - 固态化学导论课程节选

This has been achieved with the aid of a cooling system run on superfluid helium, more than 2, 000 litres of which were loaded into the telescope at launch.

BBC: Herschel space telescope to go blind

Hydrocarbons, helium, hydrogen, and volatiles in the solar system are important for human exploration and habitation because they will provide essential high-energy, high-density fuels and feedstock for off-world manufactured goods and materials for construction.

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This approach is described as a "passive" system because once initial conditions are set inside the flask, a continuing presence of helium and good insulation is all that is required to maintain those conditions.

BBC: Herschel space telescope finishes mission