Sign changing amplifier
[计] 符号变换放大器
🧩 词语组成解析
v. 交换；兑换；改变（change的ing形式）
🗣️ 情景例句
Everyone hates the banks, but we have no alternative but to use them.
人人都讨厌银行，但是我们没有选择，只能继续同银行打交道。
Would you speak a little louder?
请稍微说大声点。
At last I hung up the receiver.
我终于挂上了话筒。