Pentacontane
五十烷
🗣️ 情景例句
Are you free?
您有空吗？
Please stop by (drop in) sometime.
请于近日过来坐坐。
Be careful! Don't throw your cigarette out of the window. If you do that, you may start a fire. Put it out in the ashtray.
当心！别把香烟丢到窗外。要是你那样做，会引起火灾的。把它熄灭在烟缸里。