Surgeons in the United States and Europe have implanted such ventricular assistance devices (VAD) in 220 patients since 2000.是什么意思_Surgeons in the United States and Europe have implanted such ventricular assistance devices (VAD) in 220 patients since 2000.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句