Polybutadiene
[机] 聚丁二烯
🗣️ 情景例句
But this is what you've been working for all these years.
但你多年来的工作 为的就是这个呀。
He said he would rather not tell his age.
他说他不愿告诉年龄。
Once you begin，you must continue.
一旦开始，你就得继续。