Sumitex
脲甲醛聚合物
🗣️ 情景例句
You've been very thoughtful.
你一直都很周到。
It is better to wear out than to rust out.
与其锈掉，不如用坏。
A short while ago, my sister helped me to carry one of my old bookcases up the stairs.
几分钟前，我妹妹帮我把一个旧书橱抬上了楼。