Fagmaster
n. <英>有低年级生侍候的学生
🗣️ 情景例句
and some brushes and some paint.
刷子和油漆。
He went to the post office to mail a letter.
他去了邮局寄信。
Ethanol is more effective at a concentration of 50-70 percent;
乙醇的浓度为50％至70％时比较有效，