Xa
abbr. 辅助放大器（Auxiliary Amplifier）
🗣️ 情景例句
She was still beautiful at the age of forty.
她活到四十岁仍然很美。
How far is it from the shore of the Atlantic to the mountains?
从大西洋海岸到山脉有多远？
Theirs, I think.
我想是他们的。