Polybutadiene
[机] 聚丁二烯
🗣️ 情景例句
Mr. Stewart, I just spoke to Mr. Carlson. Stewart
先生， 我刚刚与Carlson先生通了话。
Do you often work out?
你经常锻炼身体吗？
Follow your teacher's instructions.
按照他/她告诉你的去做。