The International Air Transport Association estimated the cost to airlines at nearly two billion dollars.
VOA: special.2010.04.23
But now notice that this transport cost is going to be a different interpretation.
但是注意原先的交通成本将有,不同的解释
So this object here we could think of as a transport cost.
所以我们用这个标志代表交通成本
We'll give a name to that transport cost.
我们要给交通成本取个名字
So Y is the distance they have to travel and TY2 is their transport cost.
所以Y是他们要走的距离,而TY2是交通成本
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