由于混乱，幻灯片展示顺序出错。

The slides appeared out of ___sequence due to a mix-up.

他连续第三个夏天选择了同一家酒店。

He chose the same hotel for the third summer in ___sequence.

在科学研究中，保持步骤的精确顺序至关重要。

In scientific research, maintaining a precise ___sequence of steps is essential.