Polyacetylene
聚乙炔
🗣️ 情景例句
But, my dear niece, please do consider my words very carefully before you decide.
但是我的孩子，在你做出决定之前请一定要认真考虑我的话。
I'll know when the time comes.
到时候就知道了。
There are countless people who, ever since their early years, have learned to associate snails with food.
有不计其数的人们从小就知道蜗牛可做菜。