Heptadecene
十七碳烯
🗣️ 情景例句
What can I do for you, sir?
先生，有什么需要帮忙的吗？
His necktie is behind the book case.
他的领带在书架后面。
Last Tuesday he received a letter from the local police.
上星期二他收到当地警察局的一封信，