erratic shifts

例句：

1. 1. The weather has been erratic this week, with sudden rain and sunshine alternating.
   这周天气变化无常，一会儿下雨一会儿晴天。
2. 2. The team's performance has been erratic, with some players performing exceptionally well while others struggle.
   球队的表现不稳定，有些球员表现优异而有些则表现不佳。
3. 3. The stock market is known for its erratic fluctuations, which can be difficult topredict.
   股市以其不规律的波动而闻名，预测起来很困难。