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。
It's hard to find proof for his alleged innocence.
很难发现证据证明他是无辜的。
Only study, study hard, with strength proof you can.
只有学习，努力学习，用实力证明你可以。
Lady Gaga is proof positive that it is hard for serious women to appear attractive.
嘎嘎小姐是严肃女人很难表现得可爱的铁证。
Lady Gaga is proof positive that it is hard for serious women to appear attractive.
嘎嘎小姐是严肃女人很难表现得可爱的铁证。
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