- My brain can't hold so much information at one time.
- He was at one time so devoted to piano playing.
- At one time, she is fine, but at another, she is abnormal.
- It's a physical impossibility to be in two places at one time.
- The census is taken one time every four years in our country.
- He has at one time or another argued both for and against most of the changes in the city over the past30 years.
- At one time I used to go skiing every winter.
- once 一次