It means the person doesn't know how to speak properly or doesn't want to speak properly.

这意味着此人不知道如何正确说话或不想正确说话。

He takes Eliza home with him and teaches her how to speak properly.

他把伊丽莎带回家，教她如何正确说话。

In many languages, including pretty much all the other European languages, every single object is assigned a gender and to speak the language properly, you need to know it.

在许多语言中， 包括几乎所有其他欧洲语言中，每个物体都被分配了一个性别， 要想正确地说这种语言，你就需要了解它。