Oneinchofdraft（吃水）inasinglebargeisabout17tonsofcargo,andthat'salmostenoughtofillasemitruck（半挂车）.Combinethatwithcarryingabout30bargesinsteadofthemoretypical45,andthedroughtisdecreasingthecargoca

Question

One inch of draft（吃水） in a single barge is about 17 tons of cargo,and that's almost enough to fill a semitruck（半挂车）.Combine that with carrying about 30 barges instead of the more typical 45,and the drought is decreasing the cargo carried per tow by more than 500 semitrucks worth of goods.
combine为什么用动词原型?carry about这里是考虑的意思吗,字典查查没这个用法.

Answer 1

祈使句,动词原形开头.
carry about 在这里要根据句意来推断.
它是说一艘货船吃水一寸要载满17吨的货物,差不多可以装满一辆半挂车.那结合以上公式,将标准的45艘货船换成30艘货船的话会怎样...
所以我觉得carrying about在这里没有具体的意思,不用翻译出来,如果要直译,就是捎上,带上的意思.