at weekends meaning in Chinese

• 在周末

• weekends:    adv. (常)在周末，每逢周末。
• at the weekends:    在一周末; 在周末
• on weekends:    每逢周末; 在周末

Examples

1. They like to go ballooning at weekends .
   他们周末喜欢乘气球玩。
2. He likes to go climbing at weekends .
   他喜欢在周末做登山运动。
3. We love to get out into the countryside at weekends .
   我们周末爱到郊外去玩儿。
4. It really goes against the grain to have to go into the office at weekends .
   我真不愿意周末还要上班。
5. It opens at 8 am on weekdays , but at 9 at weekends
   平日上午8点开，但周末9点开。