sequence weld timer

例句：

1. 1. The sequence of steps in the experiment is crucial to its success.
   实验步骤的序列对于其成功至关重要。
2. 2.The sequence of events led to a chain reaction that eventually destroyed the city.
   一系列事件导致了最终摧毁城市的连锁反应。
3. 3.The sequence of letters in this word is not standard, but it's easy to remember.
   这个单词中字母的顺序并不标准，但很容易记住。