at a time
01
一次, 逐一
used to describe doing things in separate amounts, steps, or groups instead of all at once
例子
They can only serve one customer at a time during peak hours.
在高峰时段，他们一次只能服务一位顾客。
You can only take two items at a time to the checkout.
您一次只能带两件物品到收银台。
