Definition
at any single point or moment.
任何时候
This restaurant can only accommodate fifty customers at any one time.
这家餐厅在任何特定时间只能容纳五十位顾客。
Due to limited space, the library only allows a certain number of students in at any one time.
由于空间有限，图书馆在任何特定时间只允许一定数量的学生进入。
During peak hours, the gym can get very crowded with many people at any one time.
在高峰时段，健身房在任何特定时间可能会非常拥挤，有很多人。