Stereopolybutadiene
[化] 有規立構聚丁二烯橡膠
??? 情景例句
She's moving up the ranks one step at a time.
他一步一步的向上爬。
Button holes are very hard to sew.
要縫鈕扣洞非常難。
I was very glad when the boys won the relay race.
我非常高興，男同學在接力賽中獲勝。