alternate load

例句：

1. 1. The train has a unique feature of alternating between two different tracks.
   火车有独特的特点，在两条轨道之间交替行驶。
2. 2. During the holiday, we often have to alternate between work and rest.
   假期时，我们经常需要在工作和休息之间交替。
3. 3. The company decided to alternate the shifts so that everyone gets a break.
   公司决定交替班次，以便每个人都能休息。