fánqǐng bǐ qǐng gèng zhèngshì yīdiǎn cháng chūxiàn zài shāngwù yóujiàn lǐ

“烦请”比“请”更正式一点，常出现在商务邮件里。

'Fanqing' is a bit more formal than 'qing' and often appears in business emails.