Diacetylene
联乙炔, 丁二炔
🗣️ 情景例句
Yes, I told Daddy to pick blue ones.
是的。我告诉爸爸选蓝色的。
I ate oranges for breakfast yesterday.
我昨天早饭吃的是桔子。
Letters will cost a little more, but they will certainly travel faster.
这样会稍微多花点钱，但肯定是快得多了。