Heptadiyne
庚二炔
🗣️ 情景例句
Have a nice flight.
祝您一路顺风。
We are looking forward to our vacation.
我们盼望着假期的到来。
I asked a passenger if this was the Westhaven Express, but he had not even heard of it.
我问一位乘客，这是不是开往威斯特海温的那趟快车，他说从未听说过有这么一趟快车。