求翻译：Air is drawn in by an energy efficient, brushless motor. A combination of the technologies used in turbochargers and jet engines generates powerful airflow, which is accelerated through an annular aperture. Airflow passes over an airfoil shaped ramp, causing it to draw in and amplify air from around and behind the mach是什么意思？

待解决 悬赏分：1 - 离问题结束还有