Polyacetylene
聚乙炔
🗣️ 情景例句
The kids hang their stockings over the fireplace for Santa Claus to fill them with candies and toys.
孩子们在火炉边悬挂长筒袜等待圣诞老人给他们塞糖果和玩具。
I've got a hostage.
我捉到一名人质。
Hello. You must be Dr Yang. How do you do? My name's David Lee.
嗨。你一定是杨博士吧。您好！我是大卫·李。