100% match: segment in document and TM are identical, no further conditions

Context match: segment in document and TM are identical, the document structure level matches, the previous segment in source is the same and has the same translation as in previous document

Perfect Match: segment in document and TM are identical, surrounding segments in source and target are identical (before and behind afaik), document structure matches

Firstly, thanks for your efforts and time.

Your comment is brief and kind but not clear.

100% match is too easy, so does not needed any more wordings.
Others, two matches, you have introduced "structure" and "previous" or "surrounding" concepts but, there is no such thing in my hand.
In short, I have a single separated sentence(or segment) in a document and a single separated sentence(or segment) in a TM, that is all. 

Document structure:

• Heading
• List item
• Paragraph
• Table cell

More document structure

• Line break
• Soft line break
• Section break
• Pagination
• Header/footer

Surrounding should be clear. These are the elements after segmentation (so segments) preceding and following your current segment.

Make a simple check:

This is my first sentence.
This is my second sentence.
This is my third sentence.
This is my fourth sentence.
This is my third sentence.
This is my fourth sentence.

Create 2 or 3 documents with this text. Format these segments in different way, making some of these heading in one document, but not in the second and try to translate.

Looking good
I'll try it out

Thanks again.

Looking good
I'll try it out

Thanks again.