他的结论建立在未经证实的假设之上，缺乏可靠证据支持。
His conclusion was built on unfounded suppositions without solid evidence to back it up.
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suppositions英 /ˌsʌpəˈzɪʃənz/|美 /ˌsʌpəˈzɪʃənz/
解释
suppositions 是名词 supposition 的复数形式。supposition 由动词 suppose（假设、推测）加上名词后缀 -ition 构成，表示"假设、推测"的意思。unfounded suppositions 指"没有事实依据的假设"。
His conclusion was built on unfounded suppositions without solid evidence to back it up.
suppositions 是名词 supposition 的复数形式。supposition 由动词 suppose（假设、推测）加上名词后缀 -ition 构成，表示"假设、推测"的意思。unfounded suppositions 指"没有事实依据的假设"。