Polyacetals
聚缩醛(树脂)
🗣️ 情景例句
Thank you very much.
非常感谢。
Turn up your radio please.
请你把收音机开响一点儿。
and in April she was given a series of tests by a special commission of the Ministry of Health of the Russian Federal Republic.
4月里，俄罗斯卫生部一个特别委员会对她进行了一系列的测试。