Klystrons
(klystron 的复数) n. 调速管\\n[化] 速调管
🗣️ 情景例句
What's the exchange rate today?
今天的兑换比率是多少？
I can't believe it.
我简直不敢相信。
(A light year is the distance which light travels at 186,000 miles per second in one year,
一光年是光以每秒186，000英里的速度在一年内走的距离，