Polyformaldehyde
聚甲醛
🗣️ 情景例句
I have to do what I can do to support him.
我就应该尽我的力量来支持他。
What is the total circulation of this journal.
这份报刊总发行量多少？
Yes, I can. Where are they?
是的，我能听到。它们在哪儿？