Scientists say the compound is likely to cause cancer but have no hard scientific proof.
科学家们称这种化合物可能致癌，但是并没有确凿的科学依据。
Now, there is scientific proof that they do in fact understand what you are feeling.
现在，有科学证据证明他们其实明白你的感受。
But definitive scientific proof is tough to come by.
但是很难拿出明确的科学证据。
Reason for listing: 2012 doomsday itself is a rumor without any scientific proof.
上榜理由：2012末日论本身就是没有科学根据的传言。
Reason for listing: 2012 doomsday itself is a rumor without any scientific proof.
上榜理由：2012末日论本身就是没有科学根据的传言。
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