Polyphenylene
聚亚苯基
🗣️ 情景例句
He was ill at ease with people whom he didn't understand.
他和不熟悉的人在一起感到不自在。
His foot is wounded, Does it hurt?
他的脚受伤了，疼不疼？
Was there a problem.
出了什么问题吗？