这些任务必须按一定次序去执行。

The tasks had to be performed in a particular sequence.

《牛津词典》

它们按一定次序进行作用，在木材生物分解的不同时期显示出明显的菌种协调与演替规律。

They functioned in order and showed significantilly mutual coordination and succession regulations in different stages of wood biodegradation.

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新的Python解释器很容易改变这一次序，所以一定不要依赖于元素在dictionary中的特定次序。

This can easily change with a new Python interpreter, so it's important that you never rely on items being in a specific order within a dictionary.

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