There are many ways to express your serious understanding of company documents. First of all, you can prove your seriousness by showing your comprehensive understanding of the contents of the document. This includes the specific regulations, policies, procedures and other relevant information mentioned in the document. You can express your understanding in the following ways:

1. Explain the main contents of the document: You can explain the main points, regulations and processes mentioned in the document to prove your in-depth understanding of its contents.

2. Provide specific examples: By citing specific examples or cases in the document, you can better explain your understanding of the contents of the document. This helps to prove that you not only know the theoretical content, but also can apply it to the actual situation.

3. Explain your views accurately: After explaining the contents of the document, you can express your understanding and views on the document. This may include comments on some clauses in the document or suggestions for improving some processes in the document.

In addition, you can also express your serious understanding of company documents in the following ways:

1. Actively participate in the discussion: actively participate in and provide your own opinions and opinions when discussing the contents of the document within the team or with colleagues. This will not only help deepen your understanding of the document, but also show others that you are serious about it.

2. Ask questions and clarify: If you have questions or don't understand some parts of the document, don't be shy and ask questions bravely. This will help you gain a clearer understanding and show others that you are serious about the document.

3. Share what you have learned: If you think others can benefit from your understanding, consider organizing an internal training or sharing meeting to share what you have learned with colleagues. This will not only help others to better understand the contents of the document, but also show your loyalty and enthusiasm to the company.

To sum up, the ways to express serious understanding of the company's documents include comprehensive understanding of the contents of the documents, providing specific examples, accurately stating one's own views, actively participating in discussions, asking questions and clarifying, and sharing learned knowledge. In these ways, you can show others that you are serious about the document, and at the same time help to deepen your understanding and application of the content of the document.