所以这学习本身就有它自己的纪律——你不用约束自己就能学习。

So this very learning is its own discipline - you don't have to discipline yourself and then learn.

youdao

另一方面，您可能选择根本不用这样的约束，而依靠应用程序的代码来管理自己的数据完整性。

On the other hand, you may choose not to use such constraints at all and rely on your application's code to manage its own data integrity.

youdao

通常，即使您希望以松散的方式应用在本专栏上一篇文章中讨论过的约束，您也应该有某种模式供文档使用(如果不用于其它东西的话)。

Generally, even if you wish to apply constraints in the loose way discussed in the last installment of this column, you should have a schema of some sort, for documentation if nothing else.

youdao