unpredictable behavior

例句：

1. 1. The stock market is notoriously unpredictable.
   股市以其不可预测而闻名。
2. 2.The weather forecast was completely unpredictable.
   天气预报完全不可预测。
3. 3. The outcome of the election was unpredictable, and many people were surprised.
   选举的结果不可预测，许多人感到惊讶。