Sppa
abbr. single-pumped parametric amplifier 单频抽运参量放大器; Society for the Preservation of Poultry Antiquities 家禽古迹保护协会
🗣️ 情景例句
When he came to the States five years ago, he had only forty dollars in his pocket.
五年前他来美国时，口袋里只有40美元。
I didn't read the whole paper, front page.
我没有看到报纸的全部，我只是大概看了头版。
They have to work hard to support their family.
他们必须努力工作来支持他们的家。