Fcv
abbr. fill-and-check valve 注入与检查阀门
🗣️ 情景例句
Fine. Good-bye.
好的，再见。
I enclosed some photographs in my letter.
我在信封里装了一些相片。
He had been the first to turn a telescope to the sky,
他是第一个把望远镜对准天空的人，