The sulfur strategy goes like this: Researchers release sulfur particles from high-flying aircraft or large balloons in an attempt to mimic volcanoes.

注入硫颗粒的策略是这样的：研究人员通过高空的飞机或大型气球释放硫颗粒，以此试图模仿火山爆发的效果。

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Among those vertiginous research efforts was Project Excelsior, which sought to answer questions such as: Could someone escape from a high-flying aircraft or space capsule using a parachute?

在这些令人眼花缭乱的研究工作，为项目怡东，试图回答这样的问题：请问有人从飞机在高空飞行或太空舱使用的降落伞逃生？

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The aircraft was flying at such a high altitude that we could hardly see it.

飞机飞行的高度是这么的高，以致于我们几乎看不到它。

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Regional, Conventional Dimensions: SDI can enhance regional and conventional security and deter adventurism by providing protection against ballistic missiles and high-flying aircraft to U.S. and allied forward-based ground and naval assets including conventional forces throughout the world.

CENTERFORSECURITYPOLICY: Center for Security Policy | An Assessment Of Future Requirements For US Strategic Forces And Strategic Arms Control

In contrast to the Predator, which typically flies at an altitude of 15, 000 feet, the Global Hawk is a high-altitude aircraft capable of flying at 65, 000 feet, beyond the reach of any ground-based weapon.

ECONOMIST: Unmanned aircraft

Typically, successful applicants have significant qualifications in engineering or science, or extensive experience flying high-performance jet-aircraft.

FORBES: Looking For Work? NASA Is Hiring Astronauts