Avcs
(avc 的复数) abbr. average variable cost 平均可变成本
🗣️ 情景例句
Oh, it's OK.
噢 ，没关系。
The firemen fight fires and rescue people.
消防队员和火灾搏斗，拯救人们。
Mary is still writing letters. She's been writing letters all day.
马力还在写信，她写了一整天的信。