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。
2
As fuel costs rise, households may cling more tightly to the money not going to the pump. And that will place yet another drag on an economy still struggling to create jobs.
当燃油价格上涨时，家庭投入到加油站的钱可能更少，这将会称为一个努力创造就业的经济体的另一个拖累。
3
Until rates rise, the cost to the Banks of unwinding them is high enough to act as a drag on disposals.