The only difference between the semi-block and block is that the body of the letter is ranged left, without indentations, as in full-block style and there is a line space between paragraphs.

• 半齐头式和平头式的唯一不同点是信件的正文从左边顶格开始写，这一点同完全齐头式一样，另外段落之间要空一行。