| 单词 | solid proof |
| 释义 | solid proof If there's any challenge, it's what to say to those who demand solid proof these ideas are worthwhile. Times, Sunday Times (2013) And if taxpayers are going to foot the bill for subsidies and interventions, we will want solid proof that they work. Times, Sunday Times (2009) I don't think there is solid proof. The Sun (2011) |
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