Meaning of fēn xīn:
分心
to divert one's attention; to get distracted; (courteous) to be so good as to take care of (a matter)
Tā shàngkè shí zǒng shì hěn róngyì fēn xīn.
他上课时总是很容易分心。
He always gets distracted easily in class.
Gǎnxiè nín zài bǎi máng zhī zhōng chōukòng lái chǔlǐ zhè jiàn shìqíng, zhēn de hěn gǎnxiè nín de fēnxīn.
感谢您在百忙之中抽空来处理这件事情,真的很感谢您的分心。
Thank you for taking the time out of your busy schedule to handle this matter, I really appreciate your attention.