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
My feeling is that you ought to stay home tonight.
我觉得今晚你应该呆在家里。
Is this your book?
这是你的书吗？
The woman was a visitor. She did not live in London. She lived in the country.
这老太太是位游客，不住在伦敦。