R-f preselectors
[电] 射频预选器
🗣️ 情景例句
It's really different from what I expected.
这和我想象中的很不一样。
Would you mind calling back sometime?
你介意找个时间打电话回来吗？
As is so often pointed out, knowledge is a two-edged weapon which can be used equally for good or evil.
正像人们常常指出的，知识是一把双刃刀，可以用于造福，也可以用来为害。