There's something about color that is so abstract that it is difficult for it to function in conjunction with solid form.

颜色有非常抽象的地方，让它很难和实体的形状配合。

youdao

The lexical units in language are abstract, existed in speech with different forms, such as solid form and separation form.

语言中的词汇单位是抽象的、概括的，以各种具体形式存在于言语中，包括凝固形式和分离形式。

youdao