现代客机的固定成本巨大，但是其边际成本-在未满的前提下每增加一名乘客所增加的成本-非常低。
The fixed costs of modern passenger aircraft are very high, but the marginal costs--the costs of carrying one more passenger if the plane is not full--are very low.
车内可以容纳6人，因此豆荚车通过固定的双车道让乘客迅速下车。
With a capacity for six people, the pods then whisk passengers away on a two-lane, fixed track.
想想看——工作时间漫长又不固定，日夜者得上班，横跨许多时区，随时都得呈现出体丽的模样，而且不论面对开心或不列心的乘客都得保持脸上的微笑。
Think about it-long, irregular hours, day and night, many time zones, and all the time looking good and having a smile for happy and unhappy passengers alike.
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