我察觉到他的不对劲。
wǒ chájuédào tāde búduì jìn 。
I became aware of something wrong with him.
她察觉到周围的变化。
tā chájuédào zhōuwéi de biànhuà 。
She became aware of the changes around her.
我们应该察觉到自己的不足。
wǒmen yīnggāi chájuédào zìjǐ de bùzú 。
We should become aware of our own shortcomings.