Olefins
n. 烯烃; 链烯
🗣️ 情景例句
will read a poem by Robert Frost.
要朗读Robert Frost作的一首诗。
Such beginning, such ending.
有怎样的开始，就有怎样的结束。
An aeroplane offers you an unusual and breathtaking view of the world.
飞机上，你可以观察世界上非同寻常的奇妙的美景。