Zeihan says there is no other transportation fuel as dense in energy, as flexible and as easy to transport and use as petroleum.
扎汉说，没有哪种其它交通燃料能像石油一样密集、灵活、易于运输和使用。
3
In V6, this has been replaced by a channel framework based configuration, which is a much more flexible mechanism for supporting the input and output of transport end points.