Alkylphosphonate
膦酸烷基酯
🗣️ 情景例句
His collection of paintings is most impressive.
他的绘画收藏令人叹为观止。
We've only sold our product at trade fairs, not in an on-going sales campaign.
我们的产品只在商展时展售，而没有办促销活动。
John's day.
约翰的一天。