at least / at once

• at least  적어도, 최소한

Some people recommend eating an apple at least once a day.

You need to stay in bed for at least three days.

How many times have you been to the ocean?

> I've been there at least six times, maybe more.

 

• at once 즉시 

Son! Come back here at once!

When we heard the fire alarm, we left at once.

She went to her sick mother at once.

Can I give you the money meant week?

> No! I need it at once! Please come to my house now and pay me.