There were no severe complications in photodynamic therapy or percutaneous cryoablation with argon-heliumsystem.
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。
2
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。
3
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.