我对他的解释感到疑惑。
wǒ duì tāde jiěshì gǎndào yíhuò 。
I feel puzzled by his explanation.
她有一些疑惑需要解决。
tā yǒu yīxiē yíhuò xūyào jiějué 。
She has some doubts that need to be resolved.
他对这个决定感到疑惑。
tā duì zhègè juédìng gǎndào yíhuò 。
He feels uncertain about this decision.