1. be based on 以……为基础；
His actions were based on a false assumption.
2. no longer 不再；已不；
Sport is no longer so important in the school timetable.
3. go against 违背；违反；
Changes are being made here which go against my principles and I cannot agree with them.
4. in public 公开地；当众；
Most people have a horror of speaking in public.