Allenes
二烯烃
🗣️ 情景例句
Hmm, interesting.
嗯， 有意思。
He who is ashamed of asking is ashamed of learning.
耻于问者耻于学。
They will hardly know which facts to select from the great mass of evidence that steadily accumulates.
对于逐渐积累起来的庞大材料，他们几乎不知道选取哪些好，