Senses
左不过/ 左不過 anyway
In any case, anyhow, or in any event
左不过/ 左不過 at most
Used to express a maximum amount or limit, meaning at most or at the very most.
左不过/ 左不過 must be
Used to express certainty about a situation, meaning certainly or it cannot be otherwise.
左不过/ 左不過 merely
Only; just