Cellulosan
纤维聚糖
🗣️ 情景例句
I'm sorry, but I've got to be on my way.
很抱歉，我必须走了。
It's a shame this restaurant is so expensive.
太遗憾了，这家餐馆太贵了。
Man-made satellites have been sent up into space by many countries.
许多国家都成功地把人造卫星送入了太空。