问题: Some people say it began over tensions that developed during the American Civil War.
翻译这句，over什么词性 什么意思
解答:
History experts are not really sure how the dispute started. Some people say it began over tensions that developed during the American Civil War.
有人说争端源起于美国内战期间形成的对立情绪。
over 介词，在……之上，这里是指“基于对立情绪上而形成"
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