Sffd

abbr. step-function frequency discriminator 阶跃函数鉴频器

🗣️ 情景例句

It was our pleasure.
不胜荣幸。
Bet you can't catch me.
打赌你无法捉到我。
That sounds very interesting. How long will it take you to collect enough money?
听起来倒是挺有趣的。你要花多长时间才能筹集到足够的资金呢?
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