Cathetron
[电]外控式三极汞气整流管
🗣️ 情景例句
Are you serious?
你说真的吗？
To hover
盘旋
Happy birthday! said Polly, and gave Ann her present---a red feather.
“生日快乐！”波利说，然后给安送礼物--一根红羽毛。