Polycoumarone
[化] 聚香豆酮; 聚氧杂茚
🗣️ 情景例句
If you don't like it, I whis you would say so.
如果你不喜欢，我希望你能说出来。
Do not sell the bear's skin before you have caught the bear.
熊未到手休卖皮（勿过早乐观）。
One authority on spiders made a census of the spiders in grass field in the south of England,
一位研究蜘蛛的权威对英国南部一块草坪上的蜘蛛作了一次调查。