Polyyne
聚炔烃
🗣️ 情景例句
There has been very little progress this term.
这学期没有什么进步。
We're Killing Ourselves, in which he tries to sketch life in the year 2000.
“我们正在自杀”，在这本书中他简述了2000年的生活。
The cave might never have been discovered has not the entrance been spotted by the distinguished French pot-holer, Berger.
若不是法国著名洞穴探险家伯杰由于偶然的机会发现了这个洞口的话，这个洞也许不会为人所知。