Pvfm
[化] 聚乙烯醇缩甲醛
🗣️ 情景例句
Have you ever done any work in this field?
你曾经干过这一行吗？
One woe doth tread upon another's heels.
祸不单行。
one ought to have at least two or three hobbies, and they must all be real.
至少应有两三种爱好，而且都比较实际。