huì / yì / shí / jiān / yǐ / jīng / dìng / le / léi / dǎ / bù / dòng / shuí / yě / bù / néng / lín / shí / gēng / gǎi

会议时间已经定了，雷打不动，谁也不能临时更改。

The meeting time has been fixed and cannot be changed at the last minute.