Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
Thanks for the advice, but this is something I have to figure out myself.
谢谢你的建议，但这件事我必须得考虑一下。
The brave man hazards his life, but not his conscience.
英雄的人可以冒生命危险，但不冒良心危险。
Last week Mrs.Mills went to London.
上星期米尔斯夫人去了伦敦。