这么敏感的问题,最好还是当面解释,免得在邮件里产生误会。Zhème mǐngǎn de wèntí, zuìhǎo háishi dāngmiàn jiěshì, miǎnde zài yóujiàn lǐ chǎnshēng wùhuì.For such a sensitive issue, it is best to explain it face to face, to avoid misunderstandings in email.
有什么意见,你可以当面跟他说。Yǒu shénme yìjiàn, nǐ kěyǐ dāngmiàn gēn tā shuō.If you have any comments, you can tell him to his face.
我想当面谢谢你昨天的帮助。Wǒ xiǎng dāngmiàn xièxie nǐ zuótiān de bāngzhù.I want to thank you in person for yesterday's help.