Poly(vinyl fluoride)
[化] 聚氟乙烯
🗣️ 情景例句
She always reminds him of Grandma. Susan
总是让他想起奶奶。
What is your hurry?
什么事让您这么着急呢？
Once the existence of this wave-length had been discovered,
一旦这种波长的实际存在被发现，