Fcv
abbr. fill-and-check valve 注入与检查阀门
🗣️ 情景例句
There is an emergency. Please send a fire engine.
这有火灾，请尽快派消防车来。
How is the weather today?
今天天气怎么样？
This makes copies, using a mirror, a roller and special black powder.
传真机使用一面镜子，一个滚筒和持制的黑色粉未制作复制品。