He did everything he could to reassure the doubters.他尽其所能来消除怀疑者的疑虑。I hope to convince any doubters in the audience that our policies will work.我希望使听众中持怀疑态度的人相信我们的政策是可行的。Some doubters fear this news may not be as good as it appears.有些持怀疑态度的人担心这条新闻并非像报道那般美好。