Hexadiyne
[化] 己二炔
🗣️ 情景例句
but they need me at the hospital today,
但今天医院有事，
An empty sack cannot stand upright.
空麻袋，立不直。
They got on so well that Fred decided not to go to the lecture but to show the tourist around the university instead.
他们相处得很融洽，于是弗雷德决定不去听课，而带领这位游客到这所大学各处参观。