They made accusations which could not be substantiated.
他们提出的指控不成立。
This article is vague and general in content and must be substantiated.
这篇文章内容空泛，必须加以充实。
That statement has since been removed because it was false and could not be substantiated.
这个陈述已经被移除，因为它是错误的而且是无法被证实的。
That statement has since been removed because it was false and could not be substantiated.
这个陈述已经被移除，因为它是错误的而且是无法被证实的。
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