Thiirene
[化] 硫杂丙烯环
🗣️ 情景例句
Either I'm at the hospital doing paperwork,
不是我在医院办公事，
Don't forget to put stamps on the letter before you mail it.
不要忘记在寄信以前把邮票贴在信封上。
Thank you, sir.
谢谢您，先生。