C.
成人 Adult Edu[医] 接触; 接触人, 以, 用, 和, 居里(放射性强度单位), 卡
🗣️ 情景例句
Please do the work at your own convenience.
请在方便时把这事做一做。
Hard to say.
很难说。
Both the police and the workmen were grateful to the student for this piece of advance information.
警察与工人都对那个学生事先通报情况表示感谢。