yóujiàn lǐ xiě huìyì zàndìng zhōusān xiàwǔ yìsi shì zhège shíjiān kěnéng hái huì biàn

邮件里写“会议暂定周三下午”，意思是这个时间可能还会变。

Writing 'the meeting is tentatively scheduled for Wednesday afternoon' in the email means that this time may still change.