Pyromellitic dianhydride
[建] 苯四甲酸二酐
🗣️ 情景例句
Easy, Philip, easy.
慢慢来， Philip ，慢慢来。
It must be rather difficult for us to push any sales if we buy it at this price.
如果我们按这个价格购买，将很能难推销。
and existence an empty laugh braying across the mysteries;
如果存在不只是对神秘事物的一种空虚的笑声，