主语问题
"When" --> limit the range --> wrong in this care compared with "ongoing trade imbalance with China and Japan" vs "the US" --> wrong comparison
比较不符
'their' is wrong (the united states must be singular - yes, i know this is confusing, because 'states' would be plural) and, in addition, this sentence literally says that the u.s. sold record exports to mexico while it was being compared with... (i.e., all the sales happened while some random analyst was making a comparison).
we do not want to compare trade imbalances with US
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