For a very long flight about half the fuel being carried on take-off is needed simply to carry the fuel required to carry the passengers.

对一个飞行距离超长的航班来说，起飞时所装有的燃料中有一半之所以需要是因为载这么多乘客按规定需要装这么多燃料。

youdao

For a very long flight about half the fuel being carried on take-off is needed simply to carry the fuel required to carry the passengers.

对一个飞行距离超长的航班来说，起飞时所装有的燃料中有一半之所以需要是因为载这么多乘客按规定需要装这么多燃料。

youdao