On really long flights, fuel can account for 40% of a plane's take-off weight, so that around 20% of the fuel is used to carry the rest of the fuel.
在特别长的飞行时，燃料可以占到飞机起飞重量的40%，所以大约有20%的燃料时用来运输其它燃料的。
2
I plan to live without a car until I find the perfect hybrid, electric or fuel cell vehicle that won't break my bank account.
我打算维持这种生活方式，除非我找到了更好的混合，电的或者燃料电池并且不会超出我的财力的机动车。
3
However, it will take time for fuel cells to penetrate markets now served by other power sources, and commercial demand will continue to account for less than half of all fuel cell spending in 2016.