Ppg
abbr. 聚丙二醇；脉冲程序发生器（ programme pulse generator）；每加仑脉冲数（Pulses Per Gallon）；聚醚
🗣️ 情景例句
Quiet!
安静点儿！
Wouldn't that be too much bother?
不会太麻烦吧？
Can you see it?
你看见了吗？