Annelation
[化] 增环反应; 成环; 成环反应
🗣️ 情景例句
What's the deadline for claim?
索赔的有效期多长？
Rising volcanic ashes
升起的火山灰
No one suspected that there might be someone else on the farm who had never been seen.
谁也没想到农场竟会有一个从未露面的人。