sequential investigation observation

例句：

1. 1.The sequence of events was unpredictable.
   事件的序列是不可预测的。
2. 2. The sequence of steps required for the task was clear.
   完成任务所需的步骤顺序是清晰的。
3. 3. The sequence of colors in the painting is beautiful.
   这幅画中颜色的序列很美丽。