PPO Plans - is a combination plan, which works like an HMO, but allows patients to see any physicians they choose whether they participate in the plan or not, at an increased fee.是什么意思_PPO Plans - is a combination plan, which works like an HMO, but allows patients to see any physicians they choose whether they participate in the plan or not, at an increased fee.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句