数字的规律系统也让算术更加清晰易懂。

A regular system (of number-words) also makes arithmetic clearer to understand.

youdao

第二，对人、事物和抽象规律系统的兴趣。

Second, interest in people versus things and abstract rule systems.

youdao

（这里）只有一条有规律的溪流，因为没有水坝，所以生态系统会完全不同，湿地会更少。

You just have a regular running stream, because there is no dam, so the ecosystem would be completely different, there would be fewer wetlands.

youdao

These things happen from time to time, but they happen with enough regularity that there's something we really want to understand as a systematic-- as a systematic phenomenon.

这样的事情时有发生,而且具有一定规律性,所以我们希望能够,弄清楚这其中的,系统性现象

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