Markdown first line indent method

Is defined as the paragraphs markdown by one or more continuous text composed of a plurality of intermediate spaces and tab will be considered a single space.
But sometimes do need to how to do this when the indentation space or tab?

1. em space

The input to the full-width half-width. After two spaces can be indented two characters.
E.g:

测试的三句话：1.这是第一句话  //末尾两空格以换行
　　　　　　　2.这是第二句话  //开头7个全角空格以缩进，末尾两空格以换行
　　　　　　　3.这是第三句话  //开头7个全角空格以缩进

Test three sentences: 1. This is the first sentence
　　　　　　　2. This is the second sentence
　　　　　　　3. This is the third sentence

2. Direct write

不断行的空白格 或 
半方大的空白 或 
全方大的空白 或 

E.g:

测试的四句话：  
    1.这是第一句话  //末尾两空格以换行
  2.这是第二句话  //末尾两空格以换行
 3.这是第三句话  //末尾两空格以换行
　4.这是第四句话  //开头1个全角空格以缩进

Test four points:
    1. This is the first sentence
  2. This is the second sentence
 3. This is the third sentence
　4. This is the fourth sentence

It can be seen, each blank indentation ratio of 4: 2: 1: 1.

Personal feeling, in the Chinese environment, the first line indent is aligned using the full-width space is most convenient.