He's difficult at the best of times usually he's impossible.
他即使在情绪最好的时候，都很难相处－－平常就更令人受不了了。
The facilities were not ideal but we managed as best we could.
设备不理想，但我们已经尽了最大的努力。
She's a career woman and a mother, so she has the best of both worlds.
她又当职业妇女，又当母亲，两全其美。
