一个英语问题,请高手进
一个新概念三的句子:Ithasbeenestimatedthatifthebridgewerepacketwithcars,itwouldstillonlybecarryingathirdofitstotalcapacity.这句的译文是:据估计,若桥上摆满了汽车,也只不过是桥的总承载力的1/3.后半句的becarring,我不明白在句子做什么成分,希望对后半句给予详细分析解答,如果再能举几个例子再好不过了。Icanneverthankyoutoomuch!!!