Pcas
(pca 的复数) abbr. 污染控制局（Pollution Control Agency）；极地冷空气堆吸收, 极冠吸收（Polar Cap Absorption）；波特兰水泥协会（Portland Cement Association）
🗣️ 情景例句
We'll come upstairs and get you in a little while.
我们待会儿就上楼来带你下去。
Is it yours?
它是你的吗？
She was offered a job as a translator, but she turned it down.
有人请她去作翻译，她拒绝了。