Polypropylene
n. 聚丙烯\\n[化] 聚丙烯
🗣️ 情景例句
What can I do for you, sir?
先生，有什么需要帮忙的吗？
He that lives well is learned enough.
生活好者，博学多才。
and assuming such an automatic messenger picked up our first broadcasts of the 1920's,
假定外星人的这种自动化信息装置接收到了我们二十世纪二十年代的第一次广播信号，