Cyclopentene
环戊烯
🗣️ 情景例句
You never know what you can do till you try.
除非尝试，否则你永远都不知道你有何价值。
Please let me know.
请告诉我一声。
Are you really going to retire, miss Marsh?
马什小姐，您真的准备退休吗？