事物发展往往有一定的次序和规律。

Shìwù fāzhǎn wǎngwǎng yǒu yīdìng de cìxù hé guīlǜ.

Things often develop with a certain order and regularity.

做实验时，要按照正确的次序一步一步来。

Zuò shíyàn shí, yào ànzhào zhèngquè de cìxù yí bù yí bù lái.

When doing an experiment, you must follow the correct order step by step.