K-r
[医][=an anti-cancer compound extracted from trypanosomes]从锥虫提取的一种抗癌复合物
🗣️ 情景例句
You have been working on this for some time, Richard.
你从事这工作已有一段时间了， Richard。
I'm brushing my teeth in the bathroom.
我在浴室刷牙。
Two of his assistants had been working busily since eight o'clock and had only just finished.
他手下两名店员从早上8点就开始忙碌，这时刚刚布置完毕。