keep one's legs

例句：

1. 1. We need to keep the lights on during the night.
   我们需要在夜里保持灯光。
2. 2. The company needs to keep its employees happy to maintain high productivity.
   公司需要保持员工开心以维持高生产力。
3. 3. Keeping up with the latest technology is essential for success in today's world.
   跟上最新的技术对于当今世界的成功至关重要。