Polyacid
a. 多酸的
🗣️ 情景例句
The advanced class starts at ten o'clock.
高级健身课十点钟开始。
Who do you think you are?
你算什么东西？
His answer was to lift the vessel out of the water by making it ride on a cushion of air,
他的解决办法是把船体提离水面，让船在一个气垫上行驶，