她擅长在人群中认出多年未见的朋友。

She is good at ___spotting long-lost friends in a crowd.

她在人群中一眼就认出了那个穿红衣服的女孩。

She had no difficulty ___spotting the girl in red among the crowd.

医生擅长在早期发现健康问题。

Doctors are good at ___spotting health issues early.

他的衬衫上沾了一些咖啡渍。

His shirt was ___spotted with coffee stains.