Polyacetals
聚缩醛(树脂)
🗣️ 情景例句
When you're ready to get off, remember to press the button near your seat.
当你要下车时，记得按你座位旁的按钮。
We should require a survey report, so that we may know the extent of the damage.
我们将要求出具检验报告，以便我们能了解损坏的程度。
That's Su Weifang.
那是苏魏芳。