In Engpsh, "正在快速充电" would be translated as "charging quickly." This phrase comes from the verb "charge," which means "to supply (a battery or other device) with electricity," and the adverb "quickly," which means "in a short time; rapidly."

Here are some example sentences in Engpsh and their Chinese translations:

"My phone is charging quickly right now." ("我的手机现在正在快速充电。")
"I need to charge my laptop quickly so I can finish this report." ("我需要快速充电我的笔记本电脑，这样我就可以完成这份报告。")
"The electric car is charging quickly at the charging station." ("电动汽车在充电站快速充电。")