The software can work out, for example, the exact rate at which a plane should rise into thinner air (to reduce drag) as fuel burn makes it lighter.

比如，它能够计算出飞机向最薄的云层（以减轻阻力）上升的准确率，以减轻飞机自身重量。

youdao

You now have your maximum aerobic heart rate, which again is the maximum heart rate that you can workout at and still burn mostly fat for fuel.

现在，已得出您的最大有氧心率，它同时也是您可以使用的，主要是以燃烧脂肪为燃料的最大心率。

youdao

It is the rate at which you burn fuel.

它的速度是你燃烧燃料。

youdao