Annulation
n. 环\\n[化] 增环反应; 成环; 成环反应
✅ 同义词
🗣️ 情景例句
It's common practice.
这是惯例。
It's not up to his usual standard.
这次没有达到他平时的水平。
the strangest of them being perhaps the hovercraft.
其中最新奇的要数气垫船了。