Heptalenium
并庚间三烯离子
🗣️ 情景例句
No. Please endorse the check at the back.
不会的，请在支票背面签名。
I appreciate your helping me.
感谢你的帮助。
I felt very nervous when I went into his office.
我走进他的办公室，感到非常紧张。