Usages of сомневаться
Если уж сомневаешься, бронхит это или ангина, то лучше не лечиться наугад, а показать горло врачу.
If you’re unsure whether it is bronchitis or tonsillitis, then it is better not to treat yourself at random but to show your throat to a doctor.
Я сомневаюсь, что этот размер мне подойдёт.
I’m not sure that this size will fit me.
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