lie behind
柯林斯詞典
1. PHRASAL VERB If you refer to what lies behind a situation or event, you are referring to the reason the situation exists or the event happened. 是造成…的原因
It seems that what lay behind the clashes was disagreement over the list of candidates. 造成沖突的原因好像是對於候選人名單意見不一致。
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