In 1958, Australian scientist David Warren developed a flight-memory recorder that would track basic information like altitude and direction.

1958年，澳大利亚科学家戴维·沃伦开发了一种飞行记录仪，可以追踪飞行高度和飞行方向等基本信息。

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As Howtoons teaches kids in a fun way about science and technology, and Makani power works on harnessing high-altitude wind power, Griffith seems to be on the right track.

Howtoons公司采用一种有趣的方式教给孩子们科学和技术，马卡尼电力公司致力于利用高海拔风力发电，格里菲斯似乎走对了路。

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Nine seconds later, the warning changed to a current alert, indicating the track had passed below the glide slope altitude.

九秒钟之后，警告转变成连续不断的警报，指示航迹已经低于下滑道高度。

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He explained that ground-based radars are able to track objects of about 10cm (3.9 inches) and sometimes smaller, depending on altitude above the earth, while other sensors can detect particles down to about 5mm (0.2 inches) in low earth orbit.

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